Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fd1b3c7dfd6568…

MALICIOUS

PDF

86.1 KB Created: 2021-06-30 23:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 799dd6d3202e42b7b2916ef4d29a28c4 SHA-1: 6bcbf1267e8a079c5ddd534fd6efc4d7fa628d53 SHA-256: a1fd1b3c7dfd6568354fa6c04dfd20f4f0ba5d5faf6c81e4623b4e0f5d6bd133
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves directing users to external, potentially compromised websites, likely for phishing or malware delivery.

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 https://b2cexpressdemo.com/userfiles/file/35754913156.pdf In PDF document text
    • https://kovtec.pl/eurostyl/photos/file/22560229285.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/xutuvuz.pdfIn PDF document text
    • http://3q1p.com/upload/file/210612020232275376xbn1wt7fbhxr.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e540e6a03---dikajebukajufivezode.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4963bef79---lulikuruvigog.pdfIn PDF document text
    • http://hibertek.com/image/files/20210606_105257.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c63e3b8173---bokemefebetavonodomatisef.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/66658496998.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8edbfa36d284acb11212e0ea091ef9c/59488349405.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2f1c4ac362af3169c6281826031082fd/jujufoxoruxamexig.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b4ec9943e---60529488321.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160891cb902b46---wiwopezukirotorijewowome.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/sng2ast0fc88jk95sfpvfsspg5/8177719876.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b908f425d12---91185475905.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/d6013c7cc026a701848dfa19c8348aa3/50492236920.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/58f8622ad3e3317ff79ebac38f0d49f1/fejotefapusubewijigar.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607695e695479---74343741182.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/nosekimato.pdfIn PDF document text
    • https://bczenekar.hu/files/file/mivapujutojawejafuvof.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/vt4o1k9kmamres38dsvovnokf4/47835994184.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/67a11ed5e115632717968d9a7ca86666/kifol.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d37dfbb213b---nagijakij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=determinism+in+a+sentencePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 17112 bytes
SHA-256: e63315d5a2849c749cd1684ecca8c15e48129ed2c1753bcc5878c0c5f3b818f5
font_01_sfnt_off00011a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AB 10228 bytes
SHA-256: 27a987ec09992767f6ad05580450e48038da0ed4602549a1febd8870649e1e9c

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