Malicious PDF — malware analysis report

Static analysis result for SHA-256 860ae39e6e5d9f7c…

MALICIOUS

PDF

75.5 KB Created: 2021-09-11 14:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b29bcb5984ef8ed7d52a88052c85c925 SHA-1: fbd4146881d83615943a235a032ca1de67a4ccd9 SHA-256: 860ae39e6e5d9f7c437c3a958cdaf3f2bd5eb085abde1e54c167f64a934ce044
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to other PDF files hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://kalkulacka-hypo.cz/userfiles/files/ruregekud.pdf In PDF document text
    • http://dentalweek.eu/userfiles/files/betikizofiwopeso.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/86216057436.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/425dea34dfffe3940835b881001f0b5e/27101546116.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/wapeximifuxulisijasoj.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315b96baf48---78733079946.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/bofofonufulexagizek.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lorad.pdfIn PDF document text
    • http://geraldinekilkelly.ie/44739168708.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/63822729742.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/poxuguk.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e1655c0e5---12257427422.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///mugorupujenun.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/rodugomos.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/dedowaw.pdfIn PDF document text
    • http://samtle.net/ckupload/files/zoxawigewuberegujaruxuxu.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/govotilebugilozalonepigef.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/jevugabujobakoxuripenasu.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/nolimobaxosazebavunopiwo.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b99dad5894a7dbcac9c48d9952281d1d/puganinimubudi.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/36674845041.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/vexurazuriwekavagez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dream+league+soccer+apk+mod+moneyPDF 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_off0000c648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC648 10976 bytes
SHA-256: 3c39c5c5768f5bdff73c3976391b8ed2e0898734cbd1e333a39eef651637360d
font_01_sfnt_off0000df8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8D 15992 bytes
SHA-256: 5181dfb554c27ffddce43fba83f459cf813a101b5ac516116fba4fcd7a8d5a58
font_02_sfnt_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1