PDF malware analysis — malicious · 7cb4de1cfd987c0a

MALICIOUS

PDF

86.2 KB Created: 2021-07-04 22:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 5b360226521bdb4df108242f15311685 SHA-1: e0f59609d4dc14f4f24782ec3bc3e8a128b75c46 SHA-256: 7cb4de1cfd987c0aa05aeb2320f14a4b6e850877ea7433bfd0535617a6c58a3d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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://arerp.kr/data/file///2791899129.pdf In PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856b6a84952---duzuwema.pdfIn PDF document text
- http://topas.lt/userfiles/file/83890150067.pdfIn PDF document text
- http://gbagencement.fr/uploads/file/venesodotomawipojazapij.pdfIn PDF document text
- https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0ce28c68---19867826810.pdfIn PDF document text
- http://aromamahabaleshwar.com/ckfinder/userfiles/files/53960930266.pdfIn PDF document text
- https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4f122553ef94f0a6acf11967c0f9f3aa/talupamoxut.pdfIn PDF document text
- http://gulfcoolcontracting.com/uploads/userfiles/file/file/fewujadupuzapi.pdfIn PDF document text
- https://balbok.net/admin/ckfinder/userfiles/files/56493842390.pdfIn PDF document text
- http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160965ac470bf5---57020664594.pdfIn PDF document text
- https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ca02d533---rezizedizawotodikigelu.pdfIn PDF document text
- https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/o6ialduc9m6kou7kg83gp07536/fasezusudevefuf.pdfIn PDF document text
- http://profitoolinfo.ru/ckfinder/userfiles/files/72987029474.pdfIn PDF document text
- https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/31f88cc924b591626c16297d695541af/sozezigi.pdfIn PDF document text
- https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ddca73d47---20406455978.pdfIn PDF document text
- https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/orb5gc8ij6o58p50il9fvk4j3d/70150909258.pdfIn PDF document text
- https://o-dance.com/upload/files/duvoxoritojekuxupeluxa.pdfIn PDF document text
- https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e05b638b---3118817194.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a07e797ef---zomibefovonesagewik.pdfIn PDF document text
- http://allseasonsart.com/uploads/fck_uploads/file/ludoxa.pdfIn PDF document text
- https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/382f7a6d7bf5ec3b5f7eb5831c18b092/13570160747.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fcj5rbfnorbhkko1s0b0inq4s3/nomalirev.pdfIn PDF document text
- https://mangmalungtea.com/userfiles/file/16794911267.pdfIn PDF document text
- https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a06d5908a2801a4840279d4398a0aa13/3860324388.pdfIn PDF document text
- https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/2734daed98fc137d7bd48477a51666e8/jumejuxakogenaxuj.pdfIn PDF document text
- https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/396833a7754749086589f3142660e157/3814529071.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cramps+while+ovulatingPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000edf1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDF1	16940 bytes
SHA-256: `6f008efa21d290da3c9aff7d7cae7e8cf8b25695c387efc2c11cc9edddc40515`
`font_01_sfnt_off000119f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119F0	10980 bytes
SHA-256: `70b960fe82ec775e79b8d340fba162214bc0acb9c01db5b1cc873200fd457523`
`font_02_sfnt_off00013358.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13358	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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