Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1aa5497bec853d…

MALICIOUS

PDF

96.7 KB Created: 2021-08-09 13:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5edc4cf0b17929a369a18bd373f58f52 SHA-1: d4543ea4801b84810f3f7937ac3bd834b8d74709 SHA-256: 7d1aa5497bec853d488c6562eed15463c0e65fb8314b342e97cbf84350fbb56c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple compromised CMS upload links further supports the classification as a malicious link distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a1b81456b---77862678441.pdf In PDF document text
    • http://bhs1966maui.com/clients/64750/File/60889173218.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/1v8ockm6gg0idje7lsuardn62c/libipowizawakokin.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/jisaluzanefafepibegudo.pdfIn PDF document text
    • http://megaeventoa100.com/clients/f/fa/fa03970f5feff24be7017758158681b9/File/39137766408.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/bekuvimevabiperi.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202108030217334079.pdfIn PDF document text
    • https://mvservice.it/file/wisobopid.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/29141304695.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/bhvgu2gjjf1an8ufe2mavj3mph/78131625128.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/50978259417.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/jupidawubusepe.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rs1kfh4l21arrle78uopjlnkrc/29887288420.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/kigoxalufe.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/06/16/widenuxebokobutowiroma.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbe2347c2f---xonaxudaramutugegir.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/1332654232.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/xilowaxibufe.pdfIn PDF document text
    • https://alternatifhosting.com/calisma2/files/uploads/womuzatokojuxajatunenokon.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a3728a94976e48ecde9ca5cb018a4b04/nidezuma.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/mg8ackssd3cja676qfi8ld5g8c/jajigigatomexelagujo.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/de70bb59e7f052644e6e9c9e042e8efb/56939172177.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/52fed02047607ca6d88af4e0a66410a6/kolotekepapigavonodija.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/i9hj71kjm05s3e1ku82d9438e4/38115834954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=all+3d+shapes+formulas+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC73 10724 bytes
SHA-256: 73e1f6ceeca4ba4f776a87b9a5ca83b5c008a1ddb9201a83df46b58af6643e0a
font_01_sfnt_off00011513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11513 16224 bytes
SHA-256: 3fd93ca51e00f7d2ae236627eecc43670b7c13d67f953913f5aa57fab211acbf
font_02_sfnt_off00012af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF2 18388 bytes
SHA-256: 797564a6c03fe5dacb9b6f661df0520df4883061be0d632e655ddb1ec94e7185
font_03_sfnt_off00015b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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