Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc8a467e212091e…

MALICIOUS

PDF

106.3 KB Created: 2021-06-26 04:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e4638bd2b204406bf8679cc8ce2c7a3a SHA-1: 917066e0afbfe8fefcbc3fa54c8028db42796aa4 SHA-256: 1bc8a467e212091e2db0b1a2767a0f00a9d9efad4f2ca05985cdf3932895364b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to host malicious files or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL findings point to a malicious document designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609212dd48d53---fubadukixata.pdf In PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a41eae7bb---fetuwivinixaleja.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f27cf1213a377a03e43d2145d37c37fa/55211535085.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30e6c2e75---49404710426.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/74466269501.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb51e65611---96002831612.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/goxikuvaniwo.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608773fb4420c---52730598078.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4aaaeb51---84310638333.pdfIn PDF document text
    • https://activepymes.com/pub/file/50046416475.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f8b7a47331fdcb07906e6fe19de3bb43/lekesonazegusunim.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/44357515151.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085258dbf908---gixezin.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/nujup.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/lp4igaue5rojkakvu7132qim5b/wavoxojikivusugijozi.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/mixuzakibinudemoletedo.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/13281710157.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48b112343c---13073878008.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a27a9da7f7d---76288226087.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/2133f75a7ad929575634ea4d72c9c80c/titogovosewe.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/45044867663.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6abf8752f---19852810193.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/a6e12ad3efed59eedf77edce3d3e38ba/18940332991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=that+time+i+got+reincarnated+as+a+slime+season+2+episode+13PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B51 18640 bytes
SHA-256: 1d4337e55cb429b70d9dd346f85c260eb73217829d8d1b6fb7a714b5fec98469
font_01_sfnt_off00012a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001424a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424A 3476 bytes
SHA-256: b5c49743a06edda0c78a045e4e0f340682ea2a3dd6b5022eef8e78f6a1a45f89
font_03_sfnt_off00014fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FDD 11268 bytes
SHA-256: 0c3970cff3b8edf02b2cc57e9eb50b957051828f8daa896a6b488d60d5248d67
font_04_sfnt_off000169fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169FD 18756 bytes
SHA-256: 3b6d67833aec21c0ff5115bb144bf6c51ecb27380b4ccf35a05ed9c5a8451d73

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