Malicious PDF — malware analysis report

Static analysis result for SHA-256 658c7a739e841842…

MALICIOUS

PDF

106.7 KB Created: 2021-06-29 01:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ef419a8119c1ed98ad87709daeb9aaeb SHA-1: 7fbceaf6477c0c22f9c92e8637d28eb3f649f76a SHA-256: 658c7a739e841842976cbaf899b2def254d46cee1879861d75c226a0e36ed13c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://thessalonikiflights.com/files/files/99680682371.pdf In PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/b645ca1a846a78a1e1cf3d14212ea462/dopabatademasolerixoluvo.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b918bb41357---lepuzevosav.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/1a334a0cff7040a705cad663bc39fd39/tapenu.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/wabopavipalugizafomif.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a2a93ef0f---67682013455.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/1u71dfns3letpacf7sjespil12/vazotapasenefalug.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/fiwigovusakawol.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f93392341e---86450034970.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/remiri.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/32997256314.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/tvvuve3ts3inu07iooabn9ig36/tusomusunisev.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/mejepajegifenuzaw.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/1ndsbvl4ci22as7isvv5kp39sn/rofatapetevidoj.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd077edbeb---97086275343.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30b9ae56db---7843471452.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/mi5jof38vbd618ud4n21uoli75/63014684102.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/5a9f7c8b68319583b522c9a44818cc6e/22664940249.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d529d83eeb3---95865291415.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/3v66k7lgmv8rk50fpmcfdkvng6/damusawerenufapaxawizoki.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/natefu.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/01ctom0kgok2lhi4l50d5r3pj9/lovar.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/5766344553.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ec032ad0ebb98750fbae44be0e92ab87/wafewukofipixokaret.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=calamine+lotion+for+bee+stingsPDF 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_off00013fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE5 10728 bytes
SHA-256: 6a2463e14c8686c93ddbdde9374c35699084c059ae9dfaf3aa5ff804afb4ad83
font_01_sfnt_off0001588a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1588A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001709c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1709C 17328 bytes
SHA-256: 77dabdbcb4fd9ee7b78134fe23b1ee63415ec253c5b2a50f333a300ffac83bae

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