Malicious PDF — malware analysis report

Static analysis result for SHA-256 a703acecaec05596…

MALICIOUS

PDF

87.2 KB Created: 2021-06-30 01:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9d106e1ecbd7ea83a1989b629f341c6 SHA-1: 2183791903397eaead4cc92aa70bf42f844afefa SHA-256: a703acecaec0559639ab22b1394f440936e86bb4a4ee6f590095e25482a76685
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, likely intended to deliver a second-stage payload or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://freehajjandumrah.com/admin/admin/uploadfiles/file/lopojapi.pdf
    • https://bbgpiti.com/userfiles/files/reradafovage.pdf
    • http://villaelen.it/userfiles/files/kolagosetavufegatap.pdf
    • http://kovacsoltvaskerites.hu/images/file/zivejabejija.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/5tvoukp5gr4285o2csgi9uep5s/remewofivemokaviga.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bd37f1f01d0---sewevadiminamexodu.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/0057a075f4cccaa0c2d4853f376d6453/norixudufa.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/onm2hd7f3afj3kvldsrja6co6i8as6vd/99051388844.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d5cc6a6302973bc9fe57bed1281693e8/76658873067.pdf
    • http://scouttautomotive.com/editor_uploads/system/files/7032438920.pdf
    • http://sowitech.vn/upload/files/zowisamewimof.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771c21b4ed4---95733053677.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9589c574d572d4353961e1bda93b7813/51832480305.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160872e1736fa1---dijasazozodisowefex.pdf
    • http://funperm.ru/content/file/buxobewixosibuge.pdf
    • https://aymfly.com/aym_image/files/tilimamuxi.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/t8bp6fg327me7j8e62cblfn9n5/luzitawup.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/2aj29fhuqofdndhkkmedt1dnb8/69115031320.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ff385eec965288d1c9a12dfda77eadc9/65619861766.pdf
    • https://advantagelic.com/singhania/downloads/file/89182638999.pdf
    • http://austria-ex.com/images/blog//file/wapetakebimi.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bc539952a9f---29357616778.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a73b31a9e24---24299780223.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+rocking+horse+place
    • 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_off0000f1b0.bin
c6f49451fa2a306347b59f4c936e9a209054e5d605e433078842bf04ceb7616c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 10612 bytes
font_01_sfnt_off000109dc.bin
a99df306a0ac0b699c67bc4cb0e3e39adb2deb2ddac33d39414d62ab02d9cf8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x109DC 17072 bytes
font_02_sfnt_off0001361a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1361A 16792 bytes