Malicious PDF — malware analysis report

Static analysis result for SHA-256 850fad0d124692ff…

MALICIOUS

PDF

127.1 KB Created: 2021-08-12 04:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ceb94d8d404f780fabeb134857cbda68 SHA-1: 009dad4ae2fc50d2d7cd6245fbe992a07dbd0331 SHA-256: 850fad0d124692ffbb8edccaf6b9b0a3c051da384e7f3cada590dfd299f10ef0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The embedded URLs suggest an attempt to distribute malware or conduct phishing operations.

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 https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/bn4iueohqknc1om6p85c357rd5/lofofetus.pdf In PDF document text
    • https://xlspandoek.nl/userfiles/file/gibofixok.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/molasajejimufifukenopur.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/bepobepixutusexanibimewu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdad8e8534---66815015219.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/sumis.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ec1a3026a6982c1d609009ddf0c2c699/62863384065.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/99724647645.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/mafogurujulumonetara.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6493ed57---11788701134.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/notukorasukizogovemojode.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fb187e8fc---79961890396.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/bujeroranurifez.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/c7359d27dbd386388013fcb44cbd1f36/momapavimogozoranufi.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/012050281783.pdfIn PDF document text
    • http://wsm.hk/images/files/rezolowuw.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/sotakelukopexerimajupuk.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/2f0po1qfv7uppe0qemrjblr002/namosakiminafopazozuliko.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/butugojajegu.pdfIn PDF document text
    • https://123natura.com/stockages/files/xenoxobiwa.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/caaaac2ea1306498edd16816b900f4d4/93846062756.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf017a06cc---6161096853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=crash+bandicoot+psx+pcPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18062 10708 bytes
SHA-256: 97452e72f601b348da2ceb765f7cf84d9be558193a31c34bdaba9ffe931c78d6
font_01_sfnt_off000198ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198AB 3024 bytes
SHA-256: e217e15c482cdec943c073b4c068002055068230110d0cf59d725adca9915a9a
font_02_sfnt_off0001a576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001bd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD88 18476 bytes
SHA-256: 4f0a24a9b2d39c3691cd69685c0f8cdb2175216d145e953e70385c8fdb851934

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