Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc892de0a7f7710…

MALICIOUS

PDF

77.4 KB Created: 2021-09-08 10:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9536d85c7ec9193ef3621989581ee92 SHA-1: 18eb41f58659c42205c9086729de6f8a9660b3f0 SHA-256: 6bc892de0a7f7710b41bf433e0b1ecabc88f4273f5c4a77556cb2977181f4a3d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.contectrade.hu/fckfiles/file/pupew.pdf In PDF document text
    • http://www.buildonhope.org/file/2150554200.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086c14fcdf7a---17970515394.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-8-7/20210807131329183307.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16274655790009.pdfIn PDF document text
    • https://magerp.org/upload/files/5418958360.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c1edc54c1---foxadaxuzamitikavolosig.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/49220329177.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a82c3ce5fc---jatixa.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c23b918288f---kojigeboxotojolifus.pdfIn PDF document text
    • http://afro-safari.com/upload/files/14509194003.pdfIn PDF document text
    • http://juentai.com/userfiles/files/98790986102.pdfIn PDF document text
    • http://sinners-party.de/media/file/doxedarububava.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///rabomodelajajawufoburari.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/53806426629.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/lugifunixukuwu.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a594f8edc5e---10568204256.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/8fd4d8dafa62df3f0ed971dd31efdccb/wifumatetatukerapabamibu.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/sanidiwuxarogi.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/nanilurowikex.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/pifitiribuk.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/27189802055.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dec3e8f452---wodaduzukozivotabezajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=causas+del+labio+leporino+y+paladar+hendido+pdfPDF 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_off0000c8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D6 17792 bytes
SHA-256: ab93bbad37357a480bfdb5530fe15cfba5f7d2d0fb38bb9adb7b9ec2407d4976
font_01_sfnt_off0000f670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 10884 bytes
SHA-256: ab30fc60ec71bec545329c61fcbdf2990861ed866ceff6a3f1aca60ccb238182
font_02_sfnt_off00010f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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