Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe07c3fb34016fe…

MALICIOUS

PDF

92.3 KB Created: 2021-08-18 16:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 08efc55f7b0c3890ee82397903b88381 SHA-1: 04ad1c6f243689279f0d4731ef2a7f05c4a52d82 SHA-256: efe07c3fb34016fe6c8c09c729d0c89259395aab6a5c4e9d5d2ef6292b49c545
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. While no scripts were extracted, the presence of external URIs and the link farm structure strongly indicate a phishing or malware distribution attempt.

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 https://crewmak.ru/uplcv?utm_term=jio+phone+themes+settings+app+download PDF link annotation
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a88cd849692---74934723163.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/72611736405.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609601a5785bf---kisokemigiw.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/lotewatatosagur.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/206776ae927d71c22efc710f1c4b25d5/20398036362.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/2787098600.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f85c8f0f03c970324420cfcfbc5c62f4/kiwusiwu.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd3052be17---sofasotadejulegerom.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/zexemojabum.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vujevupowutiwoxogabajado.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b0581d2cc---92572216904.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609771311aa3a---karazoxib.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/97573926533.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a397e4382---fanikakuwafobis.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccb1c32f00---gakojitufizafevu.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/1fdc9f202cbb63505c1c5dd1c2fae9e5/42560280344.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/35931340718.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/e4egqji4nir06sfcl1rc934aqa/papusazipibepodova.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/babiletowige.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/kiven.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/779ujailmdq9r6a67rgu5rfnp4/74126817986.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/rovigiwonopojoropigak.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/warelevus.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_off0001011c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011C 19388 bytes
SHA-256: ec5325f98e26031cffcf9525313187692e8a330f1bb5db718eeeb994d81ca1e0
font_01_sfnt_off000132ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CA 10816 bytes
SHA-256: ebec1982bea1a504b02b78d39df82cbdf08c2db1036ac8e27878135c96d631d4
font_02_sfnt_off00014b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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