Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bfc9639425e92f…

MALICIOUS

PDF

84.5 KB Created: 2021-06-26 18:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2e9c7dca2edff7ad7e337d94af18d94 SHA-1: fd41243a3134ee1b8facf623b7df8817787b1b64 SHA-256: 20bfc9639425e92fbd935729bc3eca2741a56c7e5a70b1a3e349db6b50e83635
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially malicious PDF files. The primary purpose appears to be directing users to external, untrusted resources, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://catamma.ru/uplcv?utm_term=middle+names+that+start+with+s+for+a+girl
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/8b39aafd0fdac5d9da827db299a5150c/wimagepebegajedusugegixe.pdf
    • http://palami.by/images/file/48507981410.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c31e0ebc7f---guserosomila.pdf
    • http://fixafilm.se/userfiles/file/89750248805.pdf
    • https://rinducm1.com/contents//files/jaradidak.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4c9844a1c---111524914.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087816acf102---20331299356.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607641c5bd3b5---wurutizitixidenelelum.pdf
    • https://balustrady-metalik.pl/files/josejapikukemibi.pdf
    • http://93564497.com/userfiles/51443809451.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/0c3488t2g785m5jt8q9mv10v2g/wupixax.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608867f409736---jupavafavadiviz.pdf
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/zolujezogivekemanosijeji.pdf
    • https://pmeds.us/userfiles/file/12973673554.pdf
    • http://pagyesa.org/userfiles/file/20210626060753.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a69cc928b---55473441347.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/6dcdebdf4e49b2e611efb9e597c86ee0/tasefefosinumu.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a75c61effb3---mubebuvugedif.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/276420be63ab1b108c7862317293af6a/89458769183.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67a.bin
c50a9a1416339b83e8bef899ca6e7660d7b5e70cd5292c3ce248ccdd8c357eba
pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 17552 bytes
font_01_sfnt_off000113db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113DB 16792 bytes
font_02_sfnt_off00012bf2.bin
1b22591d226cc1adb6674c0db0ee966ec2c220d0555b941c6450fd05701e71f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF2 10880 bytes