Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbaa48b1ab2f806…

MALICIOUS

PDF

74.1 KB Created: 2021-08-31 03:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c45bb30e0dd5d3673bdcacde574d72c7 SHA-1: 50be477053e60b2ea21f5ea69132375fae93d44a SHA-256: 3bbaa48b1ab2f80631afa5b7e962a05bbf6e20e558341937fca60d9bcfdbec95
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is unreadable, but the presence of numerous external links strongly implies a redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c778126100---21459746103.pdf In PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/e25583af77399b0f5d970b4d78539f94/51498738813.pdfIn PDF document text
    • http://rayanchem.com/d/files/34177897901.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4e2fdc6e1---rirufupulibo.pdfIn PDF document text
    • http://getem.pl/files/file/tovavexoxid.pdfIn PDF document text
    • http://giga.sk/storage/file/misitipuwubaginubigo.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/54169775764.pdfIn PDF document text
    • http://geasit.it/userfiles/files/wasuzebuk.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/51012206085.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086e70b30481---61260117425.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607211f3bede3---90911909974.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/zugetu.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/79001705330.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/gaxuxuge.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e91990e670---81822883736.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/43558097571.pdfIn PDF document text
    • http://kustari.net/userfiles/file/kipupoganevewereno.pdfIn PDF document text
    • https://ka-base.no/images_content/file/19239754872.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080769f0150d---21977836182.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles//file/wafesilelifikewujoxuburap.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/kavoroxovoxosup.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/tefiwev.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/49263002aa9fe1cc3bf5ad20d5a2d8f7/28996829188.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210812015244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=right+middle+lobectomyPDF 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_off0000bff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF1 16684 bytes
SHA-256: d20d71a2abe7a4fb9c7b31017228811e78311154e70a4cddf11075682506cd1e
font_01_sfnt_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 10580 bytes
SHA-256: a423ff1fb0d5781006f40847d44b2507dbf2f6b6d6e4bce33d19b008bbc21af5
font_02_sfnt_off000102c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1