Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2786162caeb3a83…

MALICIOUS

PDF

95.2 KB Created: 2021-07-23 21:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5c15076ca73e68398ae3e850a3a0444e SHA-1: ee8c01f1c1d61e3fa01bbbfdf39b1a8dc9a751c5 SHA-256: a2786162caeb3a83072f98098f587fd652470545f3e62fb377baebb3245cd301
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or SEO poisoning campaign designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d00e24eaf11---xurojaleputi.pdf In PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/94a330d7bf979dafb0331b5bf3f8f8e5/85576261306.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/savimajiva.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba40b01335c---pazujuwe.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/89e1dde8dccd378ea65e174c1f1d0cc0/wilafaduzovinomaguvipowe.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d506bbc5cea---wedeve.pdfIn PDF document text
    • https://pmms-online.com/assets/file/wepusokofimofeju.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce14aab13---kirivuxod.pdfIn PDF document text
    • http://asustainable.com/global/file/51897059653.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/9a98970a46a1b1bf570266f42a310765/jikowojuduser.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/32287205221.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b95cda322---lumokupoxujetexu.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ed81e94cd0f1eeb414a787e49298ad2b/44694812683.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/46345603119.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/pumilaridilifoper.pdfIn PDF document text
    • http://willbramephotography.com/82366616893.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1090d8103e---legibiwukifakag.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/51538066473.pdfIn PDF document text
    • https://mollis.rs//files/32172466067.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/lemukasesusipid.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/749a7ac9c5aba1d3c78746793bd0c237/50949454429.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-4/20210504171906676653.pdfIn PDF document text
    • http://health-bridge.in/upload/file/258147157.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084f418c4d5b---fusumafokanatuxuxawuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cost+of+living+in+toronto+canada+vs+dallasPDF 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_off00010fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA6 10616 bytes
SHA-256: db84e9ecc1bd06aa25a17603e8aaf94f15cb4d17fd7559090fd4598497a3869d
font_01_sfnt_off000127db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 17820 bytes
SHA-256: 44d10c15187c93e182c99552abaf845abc0bd874c6bd92435b6d75676fde643d
font_02_sfnt_off00015670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1