Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a11ca6874e144eb…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 09:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fcb815a6a5e78b0d04d0f958b718e169 SHA-1: 937396e49fa4e00c489f16a9aad7495ac6d49e5d SHA-256: 1a11ca6874e144eb16f58877870f0b3768ee0bbc59fe4bfe7897fa2e8fdba057
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f53cjle0b7ik4hrhqgh42i1o97/vabinojejuxexekoraja.pdf In PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/33rvmck0t61glfg7abah1g51io/xoxeledobugigozu.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/18kkvsk8br08pm31fr2qh8d1ss/zefido.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/kixokuniwu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c56399dba3c---115359774.pdfIn PDF document text
    • https://ijpdua.com/contents/files/58547432698.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/b03a7c40c59b68ce48bc2a40657d7e18/remodagamusep.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e2085fc706696d6c945f0169b4671a6a/537722253.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/86ejhiek6jmb1rjsr9l7nbdus7/75277924622.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/d042e0d45f80b66b6b56381921ce5a4b/56340435301.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5408bbb697---58293361986.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/devuzorejodafegabarij.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607616d595450---34410698499.pdfIn PDF document text
    • http://szpk.hu/_user/file/3553331141.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/70377927269.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/72982677875.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51fa865ca---66062849983.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/0d57a5a6bd7411d169282fce22a8d52e/sagefuzosutirasikelaxat.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af2c64b1fcf---xofit.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/a113dae04e8aa47dadcf5270eb754020/10800664432.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/22260808800.pdfIn PDF document text
    • https://tuttoadomiciliocn.it/file/45370934082.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/89693375895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=manual+alarm+call+point+wiring+diagramPDF 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_off0000ddc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC5 10736 bytes
SHA-256: 67b81c25032730de005225005720c54f533b125678a67b84f334e6b88a5a8c79
font_01_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4E 17832 bytes
SHA-256: 4048b543137a3b555e3b34d6c0ea6d7fee77ccbe66fecd0e8ee332f632bd77b5

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