Malicious PDF — malware analysis report

Static analysis result for SHA-256 4038e78643431702…

MALICIOUS

PDF

77.3 KB Created: 2021-07-01 18:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68367ff499c6592212efd9536f9816a6 SHA-1: b4f17051bc9ff02b975cbd0f88d1046c250247ad SHA-256: 4038e78643431702d641a2d4e8edb78b13e20f50dc7d6a3e1bb9ae3d650ef997
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate the PDF contains a link farm pointing to multiple compromised websites, likely intended to lure users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/7e3b5db7c4f4cb2c92637f95c8caa6f6/bowarozumomuwuwofeko.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1vcnfkf6mh2a48r5s2rm9q5fk4/gidufodetubusavuza.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/6alh4ssaarplnsi7uaq30cr9qa/jubesafujixugonanapo.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0676fe5773---kekajadotalejopixewek.pdf
    • https://hgindustrial.eu/userfiles/files/62896248803.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2201718590---mopavonilezubokili.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc941db1dde---15646060389.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07b2e00ec4---kufijigejovuzuzuvatawel.pdf
    • http://kirakuramenandsushi.com/uploads/files/vuwewepagiv.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/bc54cb17786f948fdd8cee156c9867ff/basuropazewil.pdf
    • http://roxburyhs1987.com/clients/63080/File/javanowagurefujuresiwe.pdf
    • https://cytairtool.com/test/userfiles/file/20210613_7f392.pdf
    • http://eros-arena.de/eros/userfiles/file/59513374180.pdf
    • http://cnpair.com/userfiles/file/45558315846.pdf
    • http://augsburger-dartliga.de/uploads/file/tulanug.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/684pc9c725kmutkd1vbmu1j1rl/5585293589.pdf
    • https://ubranni.com/uploader/files/89788150523.pdf
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/rupuwotalen.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c948c7694a9---81025184088.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0bfcc0cc6405a77608ec3b5f0ec1189/pidejanukopusegozok.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877b344eec3---zekevaduzidubalidopezewab.pdf
    • https://flardochform.se/userfiles/file/38967996032.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/35f4e61e835c7cca26413f7fe0e04309/pegulon.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qgmab4m0gm76r1t82agg82tq2q/52250421077.pdf
    • https://gist.github.com/tobysteward/6163902
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=laravel+ajax+pagination+with+search
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ee13764edda810282c8a812db6cf4a23/93960604384.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_off0000c5bd.bin
38fcdcfa860e7922d96d6e660919d89d8529e313690e83d5294f89e98292c603
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BD 10996 bytes
font_01_sfnt_off0000df41.bin
82cf7220c6bac546f0ab2ecb6cea6baaa1b8155532fecd5d0a7191c0b8877b13
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 18188 bytes
font_02_sfnt_off00010f8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8F 16792 bytes