Malicious PDF — malware analysis report

Static analysis result for SHA-256 9148feaca37bcd7d…

MALICIOUS

PDF

79.6 KB Created: 2021-06-28 21:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e263d8d17f458c0fe279b778503b36ea SHA-1: f1cb26be89cd5f6eb7ec7f0e21486a4d0ad20657 SHA-256: 9148feaca37bcd7deddabaee320cb62787531543df4eb9d655a26f92932b74d7
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The presence of a 'download button' lure further suggests an attempt to trick the user into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://podlahypilat.cz/admin/file/zunekagem.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/odkt2g315plh5csj5mh791lpmf/72048837946.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/rolunozidawosef.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/863e95cc2e5d08f9a3c11af88a4dedb0/95515538053.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/40875844822.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cea7dc8a66---faxezekuwajubav.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf1050e384---bixuravu.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d137fccdc5---jemoximoxegiw.pdf
    • http://kielcenoca.pl/files/file/87000498963.pdf
    • http://domholidays.com/userfiles/file/figiwamufatad.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5dbd2b7c5---32246001109.pdf
    • http://rana-international.com/userfiles/files/fitijazupilu.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48f89434ee---96764819538.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160828b299736d---fizinuwovejer.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d5a39d079---punilizafanevelagum.pdf
    • https://sluganarodu.org/userfiles/files/80785496037.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160acf1f656837---rimivebukolizij.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa07654ddc1---xajupikaresuzowadotul.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4306ee2c8---lozoduzesukebefopuj.pdf
    • http://amuseonline.com/absite/userfiles/file/86476116128.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608d330f034f5---voguxonuxepipomorog.pdf
    • http://aarogyamedico.com/userfiles/file/38737999252.pdf
    • http://zabradli-znerezu.cz/userfiles/file/zorojegetolamaditobu.pdf
    • http://veterinariomauracotti.it/userfiles/files/xarodujenoxulodezixedig.pdf
    • http://52fotki.ru/ckfinder/userfiles/files/vixunejefolejekirome.pdf
    • http://pathtojanna.com/userfiles/files/4887462625.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=wh+questions+exercises+simple+present
    • 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_off0000d076.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD076 16792 bytes
font_01_sfnt_off0000e88d.bin
1f6473b55c4ccbc039a577a582257bc9bba818cf70777a8059e1088094bd51fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE88D 10820 bytes
font_02_sfnt_off00010157.bin
cbaaff76717a3b6ff3a90ab2bd9b6d3b120d83177c7f1d67283c6d553d09f1ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 18008 bytes