Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a454761560d9699…

MALICIOUS

PDF

172.6 KB Created: 2021-07-01 00:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e7dbea3a29a7ada66adf418a1d921aad SHA-1: 0a78b188b30170be2f8d060659f89074694e8b7b SHA-256: 8a454761560d96999cf83c92e37ddfe133c0eaa369a0406bc7ef2405d07dc084
96 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, indicating a likely attempt to manipulate search engine results or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the observed link farm behavior. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9608

Heuristics 5

  • 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://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/93l293v3pnv770vhsk82svnr2n/58833407747.pdf In PDF document text
    • http://atthaya.com/file_media/file_image/file/2412629505.pdfIn PDF document text
    • http://askort.pl/Upload/file/jorinafigumiw.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/42ad59a41debc274da37f8b94b581f5d/mazovajewaxaxex.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e96d80f0223b745887f64bf734fef82f/63556811985.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763c602fc5f---nagekiravusoxudewazot.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/78892537965.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/8aeeb2b71664ab713acdc52212ad97cf/lujimirakoxepifipiwawije.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/letusirurugasasimoman.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/989091907.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6c53b91e---dajibemobemesemejirejano.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/83344501ff196ed4dd8bb60a2d540fee/vajeneduvazixuvubu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c84a558da9c3ce46d443ac7f7209b615/29399226534.pdfIn PDF document text
    • https://chp-travel.ir/data/file/zolumop.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/zejikunuberitalogare.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0d02787b5---wanizetiganikabajora.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/70b2a4cd606ee60e2a2024e22aa3252a/xezokeladademosobixak.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/14589090717.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba418740bea---8409462549.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080d82e82dc7---zazanekagatal.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/k2oskl94icqslbdqh31up9md2r/91740520211.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/803954b15461afb55b2ef76724a4eaa0/ziparapex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=death+the+kid+soul+eaterPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F673 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_01_sfnt_off00020be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20BE5 10432 bytes
SHA-256: a53cd2954105cecca28af498f24902b1fc41affe123a864ded5f2dab26e621df
font_02_sfnt_off000223af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x223AF 18640 bytes
SHA-256: d433ab38e17cbbcb84b8f236e40c9cec2e033e66632980fa2103c6c6126d4f33
font_03_sfnt_off0002542e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2542E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00026c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26C3C 17840 bytes
SHA-256: 940b2d34769c1e84602212d35f2e5298783e6273b0d06a005840682e6d5b3543

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