Malicious PDF — malware analysis report

Static analysis result for SHA-256 949ac91ba830afe5…

MALICIOUS

PDF

77.4 KB Created: 2021-09-19 15:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12a7c0f9717f1ecb8e7ba62b8abd0f60 SHA-1: c944d7b6a985829c9344cccfebdc944c749665e6 SHA-256: 949ac91ba830afe592ec43bee9131d0a87fd436fee6199ad88a60a14d16b89f8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=chal+mera+putt+2+watch+online+full+movie
    • http://tksvolga.ru/userfiles/file/42247442271.pdf
    • https://kingdom.vn/userfiles/file/fobewajetuziwizi.pdf
    • https://lescourailleurs.com/upload/editor/file/93249092501.pdf
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/8752174008.pdf
    • https://lacausedeslivres.com/userfiles/file/25851911499.pdf
    • https://mkycc4.com/kycc4.com/userfiles/files/mezimen.pdf
    • http://viorina-deko.com/images/file/34660216238.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/940c6a6b07f0caa4b4809d083c4142ef/rarejiwetinew.pdf
    • http://sipzip.com/userfiles/file/pibofugajomofodevolu.pdf
    • https://salondumariagededijon.com/userfiles/file/54756218989.pdf
    • https://yukkumpulgroup2.com/contents/files/69504896756.pdf
    • http://creativetechno.in/userfiles/file/95243782593.pdf
    • http://chinawin-consult.com/userfiles/kulipovajepeb.pdf
    • http://autosoftware.company/autoresponders_images/files/25496420746.pdf
    • http://rujiahk.com/uploadfiles/file/98763314654.pdf
    • http://www.s4b.nl/upload/files/62746806382.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/56beo3r7r0mo8h614t72trjr1v/51903857967.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16142c276839b4---tanigu.pdf
    • http://luatsugiadinhviet.com/upload/ck/files/36203900755.pdf
    • http://betheaskssd.com/flash/betheaskssd.com/file/falunujeji.pdf
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/lemimozizojunezid.pdf
    • http://www.keizerco.nl/userFiles/file/wokason.pdf
    • https://tktravelkorea.com/FileData/ckfinder/files/20210916_964073DB6F190FBD.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c968.bin
867d5e5c9c7176c1f8b7138b8b16002f096600b52c1ee7edb3aaa931707941ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xC968 10980 bytes
font_01_sfnt_off0000e2ce.bin
41bc4f05d8f71214b98b155ef9126e2bde549bb4c0971d6cf1b79db7a268a9fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 17424 bytes
font_02_sfnt_off00010fd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 16792 bytes