Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a641980cec1d84e…

MALICIOUS

PDF

72.6 KB Created: 2021-09-03 10:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a18e4c180a2da340b05c8bf0d853fb1 SHA-1: 55aaa464662adec621884687acd7cc7bc37da80c SHA-256: 2a641980cec1d84e5cb5ef3a631215a43431ffa5e3e03fe41bf5c95362204da9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_CALLBACK_LURE' suggests the document is designed to trick users into calling a phone number, a common tactic in tech support scams or callback phishing. While no scripts were extracted, the presence of numerous embedded URLs pointing to potentially compromised or disposable hosting services indicates a link farm designed to redirect users to malicious content, likely part of the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://test888.org/uploads/productsfiles/20210707050055_ec02c.pdf In PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/66628bd9bc362946e10711a89cee3a09/midipemerazuzuwawulu.pdfIn PDF document text
    • http://apcmagon.com/userfiles/11042159605.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/82a757903ab6f51f57edbe6cafb1e13f/98852325258.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/029975f59276f4c026e27251fd51d655/73730419124.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e539069feb---21355237500.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/46995772156.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/66507062743.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21cb01c7d---xosofezopexudu.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210627085224298.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817a48235e5---wenexexobob.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/95180855073.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e156e939a10---28802722503.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/mopoxisaradepinifuna.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621490514.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e8c3eb7dd---ritajadoniwazego.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161240d884c78d---12255480068.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/retolodane.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/4699233891.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/bepajararuwep.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/diruroxaxizatemur.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052510381950.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/28336lq4kc2su83asgm0q8s023/gegusizekatelemulilim.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a8e43e402df4a4163fec03a2e7ccd112/nobagevovenenularivamogaf.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f579e58d99d---21280431868.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/fcrsatvqdf2sm52dkdojebp837/webijukimusefome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=2011+jetta+manual+mpgPDF 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_off0000bbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC2 10540 bytes
SHA-256: 3a9e9c03c178171ed95e6dcf0542fc84bb3bc6575981a06d3d13d631244660fd
font_01_sfnt_off0000d3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 15868 bytes
SHA-256: 2e9e4bb53502d74b2fa63a3f10303145e52902072a3cf5e336365410cd9cc57b

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