Malicious PDF — malware analysis report

Static analysis result for SHA-256 621a4fc6b9bef463…

MALICIOUS

PDF

93.7 KB Created: 2021-07-30 04:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 78b127e80e1103e89270b92366c1db0a SHA-1: e16acdc9bc46d28c9b061cf9bbc6d7bb28718514 SHA-256: 621a4fc6b9bef463d957e066830853ef07e45ee7d0393de0ce2141c89fea7708
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external URLs, many of which point to compromised WordPress sites, suggesting an attempt to host and distribute a second-stage payload. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4ca2ad60c---23310954304.pdf In PDF document text
    • https://cowichanseniors.ca/userfiles/file/75130886152.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/46278031007.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/bexonapukorarabutekizaba.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926f986ce1e---68900082313.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607442176ff9f---202901579.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/55bangl9srg1hp69rk2jirkje2/sekalujufi.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/lugorepet.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba03b893f57---44309513794.pdfIn PDF document text
    • http://grupophi.es/uploads/files/33853912936.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff9b18336be---56620985839.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/2f97ao3ngh2kodbnqo56m0a8374akbkg/15364904178.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/wekina.pdfIn PDF document text
    • http://nessium.net/userfiles/file/zudomipuxike.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a6698e538ca---31373778512.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/37646044789.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a7a1218a81bfc5d316d4ab6942221603/36421398717.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/64219354470.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/38605963610.pdfIn PDF document text
    • https://longhoang.vn/upload/files/relavagonuwege.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/11684995936.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/28618517916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=o+que+comer+depois+do+jejum+intermitente+de+24+horasPDF 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_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off0001055b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6D 19800 bytes
SHA-256: 40ed42c3db7fd1944a9e277d12b72bbaa0da7c74b94241f33bd4fee87446ed41
font_03_sfnt_off00014e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2D 11332 bytes
SHA-256: e7b5896bbc2da2b5b6a244ca54ab3f092aee751db124358e8e328b5aab5b111d

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