Malicious PDF — malware analysis report

Static analysis result for SHA-256 544dc1eb696134ea…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 04:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68c71237f80714b7cdde1b214652fbfe SHA-1: 4a6808db2a7069674291896a56ad3fafc2977b7d SHA-256: 544dc1eb696134eaa495cdc8ae5cf02a4a9eddc7ab78b1b91044a71b715d313f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised websites. These sites are likely used to host phishing content or distribute further malware. The PDF structure and embedded URLs suggest an attempt to redirect users to malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/fab19df2c55d1633e2f1b48c4095d52c/fupivedino.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f91e37282c5---xuwep.pdf
    • https://dlt-nkp.com/fileupload//file/likazitexixowuruloxa.pdf
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/59163660086.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085e5e589186---bikazoluviginabipokamo.pdf
    • https://glycocalyx.nl/userfiles/image/file/noduzebujujuveli.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbea84beb7---25537047103.pdf
    • http://trunghungplastic.com/luutru/files/5033019205.pdf
    • http://www.parinet.fi/tiedostot/files/32750169043.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba11a678ec7---sukazivawetitovimilulolox.pdf
    • https://ecohort.biz/userfiles/files/wikefejironul.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e27a33aab61---73494568686.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087f6c6bb922---wufikaz.pdf
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/nidobuxidobulowukunenef.pdf
    • http://giftboxvietthuy.com/upload/ck/files/valobakupinuzela.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/t7ttc0nejs240bdnlmq6hpdmii/99096542273.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c05be7383---18644484049.pdf
    • http://nenkin-t.com/upload_img/ck/files/likirolunuvaledazuxukiv.pdf
    • https://rrr71.ru/upload_picture/54610435488.pdf
    • http://karthikeyanjayaram.com/userfiles/file/94346170557.pdf
    • https://gregor-biffiger.ch/userfiles/file/javepevuvilezalavumutuv.pdf
    • http://chanakol.com/ckfinder/userfiles/files/gepumosazemabidod.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/l6favcacbcnqmo2idmtu6a4ad1/wujikifoxem.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8b094a2d5dba9170924ff9d0b2aa4d09/sogonopuregorurezuwuba.pdf
    • https://fotojursa.cz/userfiles/file/teperipiwe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=area+rectangles+worksheet+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_off0000d72a.bin
d6ac385c31092a2508bb2220e630e152667b9df1110b673a8ae5e029e6b40b4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD72A 10964 bytes
font_01_sfnt_off0000f07b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF07B 16792 bytes
font_02_sfnt_off0001088d.bin
fc5871123b37817398f99ef37b1e680d7eca1054234b59d17e54a5ba38245007
pdf-font-stream PDF embedded font (sfnt) at offset 0x1088D 18336 bytes