Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f682db8a2c0e11a…

MALICIOUS

PDF

93.9 KB Created: 2021-07-07 20:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55c726a097c87117cf42582604e8ee79 SHA-1: 0e8fd66cdb8062fa4719aae33401a3766fd655cc SHA-256: 8f682db8a2c0e11af9cd0de85a10635efb76b4605b57615c916693f1c92ed9d7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites, likely for credential harvesting or to initiate further malware downloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://smidgel.ru/uplcv?utm_term=do+i+need+title+insurance+if+i+pay+cash
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/o9q6dbudmtj8n7n0v4p7e7k1a4/27489619519.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c51d103a7905762f26db1fb97f9c5ae7/46967889056.pdf
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/ludopikilepomomikatu.pdf
    • http://pauseforserenity.com/clients/1/10/1002a5d8b3740fc7390aa1937d1ec3ed/File/63483080264.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/7e264c14a642cd307ede2a7adac67fd7/58022983674.pdf
    • http://kssi.ir/public/userfiles/file/fedutobopo.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a94bdd7db2---rurujefatukovotitisazorev.pdf
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/zamuku.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/l785o28okkmdekh637ll1dgua5/82203448461.pdf
    • http://luberoff.com/userfiles/file/ruzotadela.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/8fcaacd0c76966472a9cf6f49c9e6cf9/kijerogimupewakepabaf.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/00e4eb7d95759c9ae6d091c44c79ac7a/25607857202.pdf
    • http://year-c.com/upload_fck/file/2021-6-23/20210623043651651653.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/nujisizababivop.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098c9b631489---9330784157.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ph52lv0ag27shtd2m2osra9c92/94916786381.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/ee2b732ba3f556542a658a5987a04244/37025192184.pdf
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/defuwimebalatuwuj.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/crd3cdufo8vhkg8l2pfk87ne05/rupabutagobabedudimuf.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c0c6ece85---31801464112.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160871307753e2---venaferelomodulodisewil.pdf
    • https://beaszemin.com/files/88581690752.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04448c923---fitelijupefag.pdf
    • http://ahxxzx.com/userfiles/202104/file/13924330563.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_off00010b64.bin
2a0832a50fca915a39352d15b4ae5009154794e848661b8ebc4a6f158b654e25
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 10932 bytes
font_01_sfnt_off000124b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124B5 16792 bytes
font_02_sfnt_off00013cc7.bin
5e1383f5fac24732eb63c998541c0d53090519fba48ea6b097ac929acd770fbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC7 17384 bytes