Malicious PDF — malware analysis report

Static analysis result for SHA-256 987d641e618ff417…

MALICIOUS

PDF

97.3 KB Created: 2021-08-26 09:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 43d07a9fbf73590e20920685e9b91dd6 SHA-1: 780f7be1eac2b1cbaa7a4b448238d257e8be8f6e SHA-256: 987d641e618ff417a1375a488e0aa17a8ded2bbe2a27a9ec2482eade69f47c9a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous URLs, some pointing to compromised CMS upload storage, indicating an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/f212aj4di0ed5k36frrm6dhprd/fitowopolup.pdf In PDF document text
    • http://seksdagen.nl/userfiles/file/jaripufel.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/lufodesepojixivosijune.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c376e2bbdc9---99840130039.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/gitizusiganuvupigob.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/52312797512.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d35232cfa2---50377528867.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/pidelibasezaza.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/v1l43eot097ldeajsmhevlur76/jedijewatofaru.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/56441860819.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/76262625358.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/tewiwafarunufepugazaxavig.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/25fd89fc4202fc1411cfece9411d8c6c/vezalite.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/povesanapow.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/83368590290.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/e8riuhvr1fk42v9k1rqrftp3k1/84613394961.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/607a97f9a3aed7d852df7cd3a1f9c504/fukobuwujug.pdfIn PDF document text
    • http://clingac.es/d/files/8313174862.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/buzeri.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/ec2d59ebc74d1df4aaab9d850da9f876/weriredaxugagexan.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/gemojibekurif.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/29598836122.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092633d04740---70858632405.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/xirapowowokikidasuwufi.pdfIn PDF document text
    • http://coachhouse.info/assets/file/lotumixipovofamavitad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mackinac+island+hotels+for+familiesPDF 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_off000114a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB7 10828 bytes
SHA-256: a43375882c8c02293450d4dced99babf49086f68d07da20505f129ac2a6127c4
font_02_sfnt_off0001457f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1457F 19332 bytes
SHA-256: c057a3720bd7483ae95ee334cd65f108e684199338cb9822526b90a33dab2438

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