Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0710ea903cfbb6…

MALICIOUS

PDF

80.2 KB Created: 2021-10-11 03:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d5c5876916c86465b5466eea45b462ae SHA-1: caa93cc18dc66a08e54ebe98dbe5de047fab78d7 SHA-256: 2a0710ea903cfbb6c89c2e78fbba339bfabaca772e3464ed57cc930d655a6f13
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous links to external websites, many of which are hosted on domains that appear to be disposable or potentially compromised, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://bahtiyardishekimi.com/fckfiles/file/lafobilukivep.pdf In PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/magolomoweda.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/nibupifomujajagaped.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/mokozobavaxatezatez.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/40567104639.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/34273447244.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/bekijoxowoweliso.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/k7hvahfoedjpu9oqqkhl5m4nna/17466958452.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/givudufigumudupedemu.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/jakoxuzikonuvezuwulesit.pdfIn PDF document text
    • https://digiconelectronics.com/media/37315331640.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/dilabolezoxokivaz.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/jopibus.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/rekepovezulagowaketi.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/25c6ac7e144a36e4fa3852644eb4fa0f/sibuwenefavirodogi.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/gexirutazevike.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/mazubutukaburadaronimiduz.pdfIn PDF document text
    • http://terminsk.by/pics/files/28591818664.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/42862776264.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/devugiborifumota.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/1990707272.pdfIn PDF document text
    • http://119pump.net/d/files/29447343708.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/45173871246.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16132cbe0dcf2b---36196125880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=lcm+of+6+72+and+120+isPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD37 10728 bytes
SHA-256: 96f1abcbdbb355fef618a49f313205b91d5426e4c5db4edc2d9596fa0bd668c5
font_01_sfnt_off0000d5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F5 16168 bytes
SHA-256: 6cba6677bde0f241d5abe4bd1daabf497e221bd6197b657de4268e87bbbbfee9
font_02_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 18224 bytes
SHA-256: 8f9571ed63f3bc490f82f2fa7da03683d83a5c71bb23d0bdb08f141bb84b23a6

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