Malicious PDF — malware analysis report

Static analysis result for SHA-256 9abd760239b2946a…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 16:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92bd8772404b9900595a14d49ef8e3ae SHA-1: 3f03ae3512bcdf71b3dd1ebe52256f46a3226d0b SHA-256: 9abd760239b2946a510599d55662ecf5057cc582a9cd046c819de47b64a8b3e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to potentially compromised websites or phishing lures, such as the URL containing 'android+1+subway+surfer+hack'. The PDF structure itself is also noted for containing a link farm on disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://queure.ru/uplcv?utm_term=android+1+subway+surfer+hack
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zizev.pdf
    • http://hoangduy.vn/vn/files/kodizotagupakaju.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/d31e3be086cbe0be1b31173017484994/ribafowirenanurowiraba.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/18487671084.pdf
    • https://tiguan-wiki.ru/file/52938806060.pdf
    • http://gianniarnaudo.com/userfiles/files/38271394871.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/9df7c92fb76d17a635e3695c21526b42/78473990857.pdf
    • http://www.enredmail.com/templates/files/idCliente_/file/56514090817.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a19e4793b---rotipek.pdf
    • https://clearpatth.com/userfiles/file/36853250193.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/gewafunonolaxifawa.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/4f9b7ddff9f6d5cec9f999a863e74c6e/vefaduzerixoru.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eae8bcdcdc---zebanuremuvujatolasorov.pdf
    • http://agiusfuneraldirectors.com/files/file/47963216167.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/9e7f1b75d528be8eae1c478cbc8b8860/fexukolokin.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c59039c854---vavesarediz.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/b652d6d97d3d66b21165cf603f408b9a/fetoxumimitojiku.pdf
    • http://01host.ru/userfiles/files/wexaparozemu.pdf
    • http://sfalojistik.com/userfiles/file/86179674679.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608949387c495---71320636892.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de59318c38---waduxegujafomupida.pdf
    • http://trimblehighalumni.com/clients/84492/File/lolemomufazegeriwiw.pdf
    • http://www.kowel.com/ckfinder/userfiles/files/1627963844.pdf
    • https://caror.hu/ckfinder/userfiles/files/17989342855.pdf
    • http://studiopignotti.it/userfiles/files/47074918450.pdf
    • http://ginzaoakland.com/uploads/files/88503941925.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_off0000e075.bin
e58ee934cb5519ca4826505006d1d3be43c5195142a08e9eeb344b5f2427f7d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE075 10996 bytes
font_01_sfnt_off0000fa16.bin
6305f7dccb7943d8567d3f7607274537fb0d5cce2888fd881b5061b65a000a06
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 17932 bytes
font_02_sfnt_off000128dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128DD 16792 bytes