Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2229b7a2b1308fd…

MALICIOUS

PDF

95.8 KB Created: 2021-10-05 17:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 09756a240bf4dc6230e6ec068ea6355a SHA-1: e5cd5eb0400046a7c81698e2080b7ec1fa81acb5 SHA-256: a2229b7a2b1308fd63b403e851f1004d46954b2d683fc89d4efa947f08060e39
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised CMS upload locations. The ML classifier strongly indicated maliciousness, and the heuristics suggest this PDF is a link farm designed to redirect users to external sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://allytemp.ru/uplcv?utm_term=whiny+voice+meaning PDF link annotation
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/mn1in192lp143ch28pb18opv1k/lifetoxasegopazefusifaku.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/teronofivafatewewix.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/35998515105.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/masamusasowop.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/toniwagunatukibodobiwob.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/zumimidaxofezinomazo.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/namadox.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/75469498807.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf3d36e0d---bisoxozasoki.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/widomulomimiv.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/setuketowafuvogokuv.pdfIn PDF document text
    • https://lecachet.fr/docs/files/sifutaratobepugurosokozo.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/vexagev.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ulc0q5ovenk3l4oa554m387ihv/47570144054.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/87603653390.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/29053925618.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/ludovazawinusevijasad.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/63253373859.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/88008549923.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/21205894682.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/98202242070.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/kigofumotalo.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/52924203315.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/1215743049.pdfIn PDF document text
    • 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_off00010e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 19744 bytes
SHA-256: ff48a359c5b9c5aaf5d77a875d58b1e1115cec4086529562c17407ffe78c4787
font_01_sfnt_off000141e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159FD 10440 bytes
SHA-256: 8b204401694a3c0fdb2b2ce41851e0c02abd96de6d0a51829a688c670bb2eff1