Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdb5f85f4e0f236…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 22:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 50450abc6e86e228fb45e61a64beddc6 SHA-1: d6c26a3a1e627893f127b6e1984309b3dd46979a SHA-256: 0cdb5f85f4e0f236c44a6e62a72c1c01bbf786355034be9559b29f9ff48c3dc9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and link farm characteristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://catamma.ru/uplcv?utm_term=how+can+i+earn+pokecoins+in+pokemon+go PDF link annotation
    • http://coachhouse.info/assets/file/31421544336.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/pivasawamag.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/najimubofag.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f535e78131---69170833423.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/boxusawexinisiti.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/labuvukurus.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/38191224887.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/13413099598.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/mipumemu.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/tarenixefipi.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613924ed023b4---97186159716.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/e3fq9fhcqo4j75karrj5v79eea/45520156638.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/borikukozi.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/94948911951.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/jorokivazojomok.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/48433678678.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/93127945557.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///18544312430.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/jolubapuk.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/zopokixedujumupinawa.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ev1fku1od36lrf1b0pmoqqfokc/binofimuwurititaran.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/73264448162.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_off0000dd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 18240 bytes
SHA-256: 65874ca001244629ac737a48f17eee0f9dbfa15652e02b4c3b42f7958217d6ed
font_01_sfnt_off00010d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0A 10744 bytes
SHA-256: e61372d956f7d39855ca0d38e9a527ef4539de2d46ea50057a3b9b90d934585b
font_02_sfnt_off000125c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1