Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1fa8d94b0d1c7d2…

MALICIOUS

PDF

74.6 KB Created: 2021-09-23 08:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4975e0764a586dee516b9ac0585c3064 SHA-1: d5772c0c2ddf76f6449e7241b4d0e01bab656fd9 SHA-256: b1fa8d94b0d1c7d2a97aa133c7c1c17bf2f3ebba2f80b879329a24737d145488
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites and disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://clinicaveterinariacittadivignola.com/userfiles/files/repoxedoxirowi.pdf In PDF document text
    • http://saxonrt.hu/img/userfiles/files/37042733529.pdfIn PDF document text
    • http://indexone.ru/upload/file/lowiputuwozudoxokevikom.pdfIn PDF document text
    • https://clickbox.ro/images/file/41224506185.pdfIn PDF document text
    • http://ingore.cn/upload/files/ziguropojumijizizemisujet.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb7f1a42f---89237543867.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/98623769926.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/lexaleziruxozomokosefox.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613efa2c7b486---jumebefisonozexilitixan.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/79388932196.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/vojapekomim.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/giwowofagenu.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/22584937217.pdfIn PDF document text
    • https://blokhol.com/upload/files/gopur.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/90632015202.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/56344848040.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/69742683537.pdfIn PDF document text
    • https://drgcode.managenet.ro/images/file/tujamonirifo.pdfIn PDF document text
    • http://ce-mi.pl/uploads/userfiles/files/69188970217.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/17890695563.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/baxowuriruzinelabijekine.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091104415355.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/9937790758.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4580b2d7678b9a213dd2f72903b633c9/jifura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=david+romer+advanced+macroeconomics+4th+edition+pdfPDF 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_off0000bcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50C 10984 bytes
SHA-256: 36e531ddf4a31910b5eda5fb95fffd33eeaeecfbf39a06cc29dd262fd8019ca3
font_02_sfnt_off0000ee64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 17384 bytes
SHA-256: 47ba7faf828e3afe33d193fecf2a6920feabe5b9d4fb57d03fde0af646a0de32

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