Malicious PDF — malware analysis report

Static analysis result for SHA-256 a830a1a05291abd5…

MALICIOUS

PDF

98.0 KB Created: 2021-07-29 18:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e387e6b7c1924112f332d7e65d9146dd SHA-1: d9796155a3beddeb9fddd182e5995de1b4a00966 SHA-256: a830a1a05291abd522e8a54bbd1a1a527ad2f4380ba479e7062239fd9fd0984f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://queure.ru/uplcv?utm_term=pokemon+go+mod+apk+download+android+1 PDF link annotation
    • http://www.biotanika.pl/upload/file/musitevibadegiwepizedofeb.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/52585852185.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/8e8a5596fc255e2c26db0baca6a62aa4/jelerujaju.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/botede.pdfIn PDF document text
    • http://saydersan.com/firma/files/mekodomojuweg.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/lapidonefokawazigad.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/0mqeobg83foi8lovng1rbocsfc/40057058681.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4d76d820---2369009942.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a128629f7a1---10635824424.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c928141d2a---21251645469.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/38736710687.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f30001852---lazemexikujovi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/888c5c8cd3946b00354b6fbe46581159/79294048285.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee688d74cfc---96857368894.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/56149226428.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bddc8a94266---sodumefofo.pdfIn PDF document text
    • https://andrejc.si/files/file/16272667235.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/lonanadebaxagutibomu.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/70813258056.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/54620102411.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b4b60c4df---81122655618.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/kagl81593bt2gb2aouofk2nfa3/bedowilavuwevo.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b75f288a5---48565904011.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/zifanakututi.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/nexas.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 10700 bytes
SHA-256: e4774122a5093c16daa0a60e368f5af68e77f8df97350e30e6d52156af690810
font_01_sfnt_off00011cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB7 17776 bytes
SHA-256: e81e6571c50a40755bdd99b9b4b4d2c4ad6ac98a46607dd39327edf5b3bed461
font_02_sfnt_off00014ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD3 16060 bytes
SHA-256: 4bd239deb2b2b882589b1dbe8338f6aacaf81f84d871ea0d73be77ff6a5db253
font_03_sfnt_off00015fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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