Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab373f81cae450a7…

MALICIOUS

PDF

72.2 KB Created: 2021-09-13 17:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0027b9fb3020bcd9f3efcd3aa2897db2 SHA-1: 0a5a5afc571fa41f10db86d304c42ae2ae3874aa SHA-256: ab373f81cae450a70066efadb3b5fbd7251f6e70aa76f298ed556ca11fc8d18c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting domains. The presence of numerous links suggests an attempt to lure users to external sites for further exploitation.

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://sellmysayarah.com/userfiles/files/bosibesisikenurafaluvevel.pdf In PDF document text
    • https://alsharqcc.com/userfiles/files/zijinozojomiwepaxinotex.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0a40396a---50091922055.pdfIn PDF document text
    • http://mlight.cz/archiv/file/58202722867.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/51166205415.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/mufosidibomo.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/tijuwakoxotibuj.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/nowikokokiw.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136858ad1037---76990756463.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/54067949037.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6a7153411---57114363611.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/jijufajasajabidudolumen.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/gimidupuzurilogozenagebo.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/zibozunuzetewum.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386a686967c---989432442.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/zixagadafimozizotex.pdfIn PDF document text
    • https://33mobility.net/uploads/files/33711322265.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/46156410844.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/kumimegukebuwafutaka.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/94767283924.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/lekigafuzu.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/benixejebikabawatifa.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/luwepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=live+cricket+on+mobile+phone+freePDF 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_off0000b8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D9 10672 bytes
SHA-256: 10587bfcf015f5e02b47e39f96e9cf3cb21465f1da343c111f592757cc801f27
font_01_sfnt_off0000d0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D9 16324 bytes
SHA-256: 5d5a33e1ccfd09dd966a923b552f551fccb4218649965e0f3caf08a0d924e269
font_02_sfnt_off0000fae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1