Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d06380cd91d32f…

MALICIOUS

PDF

84.4 KB Created: 2021-08-25 09:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d70439d2c8cdd95a369424d75037cfc SHA-1: 0575c9c671fb51d6a9b3a8b5f97b91cf63d9fd64 SHA-256: 26d06380cd91d32f51ba966076ee7c12032c3770377781710d0c91754dbebdc6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve to redirect users to malicious or phishing content, a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ef6d43f7e---8894563301.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609f2b6e270d8---43076899569.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fedb6086dc7d7e0518d78bfab42e0e1e/88254177215.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/610acf74e87554815ed89b12ddba3620/18751971478.pdf
    • http://creaorganization.com/depo/sayfaresim/file/rufosoruzetifupukek.pdf
    • https://szabobuszberles.hu/files/files/29610944043.pdf
    • http://biurod9.pl/public/userfiles/file/77022658992.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b0c2710a3---26834802864.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1d52e0ba0---tininorikotokugelimag.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16121aa4ae64f8---38007842287.pdf
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/rewanofanazu.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c91cac53cbb---40042395244.pdf
    • http://ufnk.fr/app/webroot/files/file/gekeledezuraxaf.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hjhn2qg856gi53u3punktdcu13/85556298167.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b553be2da69---zifuvabefijebasulatijoz.pdf
    • http://dailycan.com/userfiles/files/67052689638.pdf
    • http://rybczewice.pl/userfiles/file/62311271112.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/a09ebb04996ecaca51ea7f26e0f4ebe6/64227179109.pdf
    • http://www.herbertvanderbrugghen.nl/draft/warej.pdf
    • https://n-zvuk.ru/upload/file/54182040872.pdf
    • http://leoclubmarsala.it/userfiles/files/teziwe.pdf
    • http://abaj.cz/UserFiles/File/44740908075.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bbc74f9a8d7---mavapepenaxaj.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606f112fbf879---vijoronepigo.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe3f9704dc---kutubamorabaro.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+hunger+games+discussion+questions
    • 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_off0000e78a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 16792 bytes
font_01_sfnt_off0000ffa1.bin
ef08f92e6249904be5848cabe3afb3217a4fa8a195747beb5bc587d41802d549
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 10980 bytes
font_02_sfnt_off0001186c.bin
1565f9cccfdbd220ba21d6a26a918aa8fb31e04716197a03ac70f439e633f093
pdf-font-stream PDF embedded font (sfnt) at offset 0x1186C 16644 bytes