Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2c6ef9206a1f8d…

MALICIOUS

PDF

106.1 KB Created: 2021-09-02 02:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 341f4bdcdef10cf32ea52f0f57373d35 SHA-1: 86cf16d5985b62ce3a2d6d1742672c9870cdb8e2 SHA-256: da2c6ef9206a1f8d8505f66f4a32871fda53b2129c2ca0444ae99deaec72779c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to host malicious files. The presence of a visual download button further supports a phishing or malware distribution lure. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • 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://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/c8960f2ad9a80d517137f8c4a546a74b/4102654786.pdf In PDF document text
    • http://bookblog.kr/data/file//files/35741934708.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160808cd714af7---20864296289.pdfIn PDF document text
    • http://sealordhotels.com/ckfinder/userfiles/files/83503236290.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/47e58fb44c93099f6caa1abfefa374fd/55965930618.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160715afdd9a87---5321849439.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/rivun.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/didelurawofuk.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/60649949311.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611a5378662c2---rotalan.pdfIn PDF document text
    • http://chongros.com/userData/board/file/xuliwimatiwemodekakipem.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/lusoduzar.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/55688591380.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a8981fcde03---70055381194.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/jerazukizikakosinigamevun.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/85578321671.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/6eeaa7bb0a7f3dc62f02478dcb46f207/60586313123.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/tg43nrgfkqejv1mlpvmlatatoj/37402637572.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210613160407177.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5c6f113d3239d19331a88657db32085b/32198999711.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/89845806873.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a716f7333ec---veranagi.pdfIn PDF document text
    • http://museeducuir.org/upload/files/6644868857.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4880316713---25243617471.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/21330482288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=justice+league+snyder+watch+freePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001356b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7D 19652 bytes
SHA-256: 65389cc94c270087692613dba9ee4c7c51ccf2c1d75008301aa7ac78dfd4ddeb
font_02_sfnt_off000180e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180E0 10924 bytes
SHA-256: 7d070ae4ec305890fdc4ddfd89402f19c190265130f911d3835b2a91ba48587a