Malicious PDF — malware analysis report

Static analysis result for SHA-256 85bf3484b451c601…

MALICIOUS

PDF

86.1 KB Created: 2021-07-01 09:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73e25680c36e2b8bfe88e1590c9de56a SHA-1: 67166063b6888f4058dc6c6eafad3aae6f1b8432 SHA-256: 85bf3484b451c60169aabee95e9a39f1729b09d084a2940f9ab11de03bd8ea94
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to websites that appear to be compromised WordPress installations. These links are likely intended to lure users to phishing sites or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://chcial.ru/uplcv?utm_term=unturned+best+clothes+id
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/9ec39579b10400f57eb61e34b9c95ac4/wogatopew.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/584b99fee77b9c0f4e6478e3cb9c0f17/rewugipexofuberomazoja.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c496af8be05---loraloxeludiru.pdf
    • https://pima-alarms.net/slicice/file/98709206969.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4cd200015---1041949793.pdf
    • http://dawahcity.com/userfiles/file/49210700446.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2e3a770cf---89801861640.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607685faafe2d---79451358231.pdf
    • http://yule-sign.com/upload/editor/file/20210529202151.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64c3920fd2---fimumede.pdf
    • http://imssp.by/data/images/fxeditor/file/zetesikiwadawagevafulig.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/nofuzesadakepopowe.pdf
    • https://machinex-machines.com/UserFiles/File/xajoxuwosa.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076edffd64e6---60138884725.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa89759bbfb---17937552854.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf0e8718a6---28670359709.pdf
    • https://alatheir.com/atheirwsfiles/file/rufipakusokigeboba.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/u8anum8tvkhfr3rbh42r38e1v6/96718364149.pdf
    • https://mimpishio1bet.net/contents//files/dapujik.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a0d50ac79---83018033796.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607262a4de44c---sogoposumunuto.pdf
    • http://geoplan.su/userfiles/file/81864657120.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed41.bin
3ffea9198e5b13ff68032d9859199482dd95b30efa49338c49c6953c28a15c59
pdf-font-stream PDF embedded font (sfnt) at offset 0xED41 10552 bytes
font_01_sfnt_off00010537.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 16792 bytes
font_02_sfnt_off00011d49.bin
b208e67ca4cc4b95406cf13e6f36c4a607ba7d6ee8b2e4b30dca9dd2ce0f0bf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D49 17480 bytes