Malicious PDF — malware analysis report

Static analysis result for SHA-256 680e25449aed27c4…

MALICIOUS

PDF

78.8 KB Created: 2021-07-14 08:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 312de875015c21abfebd3476c452d920 SHA-1: fad62f863819a87aa07c22a1870ec7a4621ee03f SHA-256: 680e25449aed27c4c01c9ca6ce38a7ba605283d1e1cf48368c3af06ec6648d48
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and numerous unknown-reputation URLs point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2a23e78b4---83866060370.pdf
    • http://happy-travel089.com/CKEdit/upload/files/57370471334.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/le6jmqr82gsm1mr5t2gqsdddc1/44214456750.pdf
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bupilosapiburafizofeme.pdf
    • http://zdrowejaja.com/Upload/file/95222033454.pdf
    • http://okfilm.kr/userData/board/file/ravawonipipijudixeviduma.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be692cb703---14208042505.pdf
    • http://xedaptap.net/userfiles/file/lidomabejaduri.pdf
    • http://ecologie-energie.com/userfiles/file/nunawexajofeg.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8b4636497---xumipowikedutomajaxi.pdf
    • http://kotolantopeni.cz/file/80452530365.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd3aa09a2---45925795371.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/jegkdo89mim9av1o2mfv1svlkn/87031343398.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/071faf4b51ac2c632d9ce9fd9fc762f1/5306096253.pdf
    • https://acrgroup.nl/userfiles/file/71180086490.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/950713706769aae781a3ebd10b89ad6e/rosobukinukurawunaxilom.pdf
    • http://babamoleskine.com/files/file/tuzijopazewesupog.pdf
    • http://matsonconstruction.net/userfiles/file/lobitaxuxoweputesu.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/af038a1c5c57b4fdd350ff3a86999bfb/66682900145.pdf
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/zefutavavezogibugen.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16084f87273508---vusimogareguxosigawubid.pdf
    • http://web68s.com/upload/files/81564670041.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9201099f6---vegovagerarinolepuzo.pdf
    • https://mihalex.by/files/files/moxusinabawadubufeza.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=square+and+square+roots+worksheet+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_off0000cf38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF38 16792 bytes
font_01_sfnt_off0000e74f.bin
0e458df916ee68ba6d4e9bbd318a48a5f1a26772a230fdcf73f7859e4891b575
pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 10956 bytes
font_02_sfnt_off0001008b.bin
c5d88808c619274500baf0040030b003552300246329cfd7708baabffeaa19e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 17052 bytes