Malicious PDF — malware analysis report

Static analysis result for SHA-256 994f9fa4810e493b…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 18:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7950b83814fd12934a984d1dd7bd62ce SHA-1: 948c9923ed50914875b6ec69f91e1b23e32bc930 SHA-256: 994f9fa4810e493bd6e39fa6efcc887d95cc7a7687308b3fe87a3b22687f3093
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains multiple links, including one disguised as a movie download, that redirect to compromised websites. The heuristic 'SE_CALLBACK_LURE' suggests a callback phishing or tech-support scam pattern, aiming to trick users into contacting a fraudulent service. No scripts were extracted, but the presence of external URIs and link farms points to a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=zack+snyder+justice+league+mp4 PDF link annotation
    • http://kleinschadenexperte.de/userfiles/file/xiwedivukejepizawup.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/31500158483.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16133a7c64b655---39071790400.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/xipexodig.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/80099229761.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/lanajagakedogasaxus.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/dawowifu.pdfIn PDF document text
    • https://digireg.cn/upload/11520994782.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/30057046920.pdfIn PDF document text
    • http://tano-cable.com/d/files/86012164800.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/53754920821.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/midegakaputavavofevu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465f7bd8fea---72965893768.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/52419036061.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/zarotulapemalulit.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/dedebuzavodatepa.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/7566648149.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/64503840438.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109200616278322.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210902215913.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/30837903653.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/texafevipolud.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4057c3d0---tazak.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210911_202253.pdfIn PDF document text
    • 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_off0000cc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9F 11212 bytes
SHA-256: 1b1807dd50a5ab2779f8fb17a58774a194694ae78bb7cdd0c559caeeafb1d80e
font_01_sfnt_off0000e6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BB 19120 bytes
SHA-256: aee0e906d5694bf4cdb1596b91e8384c73e7801aff5e488fe47d02f2ec56d2d1
font_02_sfnt_off000118db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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