Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab0f8dd640e9744…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 02:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bace1c0645140e24fef65a9460e4ee5c SHA-1: cbc8f85db02950e3db5f7dd885122f72d4ebbb35 SHA-256: bab0f8dd640e9744fc40b70a386d549f95c657e6f8fc6cadc3fdfc543d868839
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on disposable domains or compromised WordPress sites, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=yds+s%C4%B1nav+%C3%B6rnekleri+pdf PDF link annotation
    • http://chi-kara.net/userfiles/file/60445943552.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/gigibedadovufusado.pdfIn PDF document text
    • https://jagominum.com/contents/files/peginexoro.pdfIn PDF document text
    • http://naucseto.cz/storage/gekob.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/wuzipegobetanotodujivos.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/fisavusufoli.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/lupimegi.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/tovebate.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/guxosod.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ad650ede76fpobr0re9ufelmfq/19075421527.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e03a85530ed---nujaromasalalojerupeli.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/manuvobol.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/d53cd2aa2d8b2cb737ce2e7e69062a84/depujisudujosap.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/3089256465.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/29740378230.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/96342830359.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/512fc6abc346893d090119575da87bb0/84597142175.pdfIn PDF document text
    • https://datajournonepal.org/files/90243138618.pdfIn PDF document text
    • https://renault-service.com/userfiles/97091077735.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/jikukezirenux.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/1b45318eb6befabeef56ff3cdef67bc2/fufuluxovekoxi.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/2j81ptpvh84hefbpdq0o3so0ru/71322123977.pdfIn PDF document text
    • 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_off0000bb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB29 10672 bytes
SHA-256: ad87a895274640fd721239c2c0bb59787ccb5c8b30728d9b7c82aad3c2bfbba9
font_01_sfnt_off0000d38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 18336 bytes
SHA-256: 64827c471fabf5dd1698ad70a29448104fec806fec030419fec6d19008dc4aa9