Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8c6a3148989bf5…

MALICIOUS

PDF

85.8 KB Created: 2021-08-15 14:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: db8879ea7d18e802f68e81df51130d9f SHA-1: 0a60098c93b44ae6bb18bed5c1444d6af9c19387 SHA-256: ab8c6a3148989bf54a00168f6fe0194981387db08dee6f000a00bd84ea64fd9d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to potentially compromised upload storage and disposable hosting, often used to distribute malware. The presence of a 'Password-protected archive lure' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://soechi.id/userfiles/file/23151327674.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/3df590188819d5b8fde3a748607fe14e/xutixisodumuwe.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/zizufixafegibojoredinofo.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608accac56a4f---jiliwazirebebivegezik.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/e258d6b41259d24f159f8120cc0eba99/gidetitawaj.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/funamigimirabeja.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607175524aa34---gezadememonagiwisidaribok.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/dazugarababuwolobijixolod.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ce45280b803721344fbcbecdd999c367/7086206857.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc4fcda191---98773975405.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/10396060468.pdfIn PDF document text
    • http://allasclub.com/campannas/file/86838566714.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/p66sg8d1sdso4ccvhmij9p0knb/88223191147.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6f999be9c---totitijor.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/2efef165124e5cb7eb7a92f61825f23c/21995353386.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/87094428610.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/gurutike.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/24934897139.pdfIn PDF document text
    • http://techbis.pl/files/file/73451428059.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e55ab97c76f---nigoxadopetinefinobagom.pdfIn PDF document text
    • http://dmhfamilyreunion.com/clients/4/44/44eff64e497b984d8b2945277059c9c0/File/wotarudomosenakarix.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/626bb7fe7c6d8cce10305b3d74fb965a/jobasugupuresexinagun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+autocad+2010+64+bit+student+versionPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E4 11296 bytes
SHA-256: f7f397748ad21ff7f565af30974c69c986ea238922c6f29aba20f0e31ae3bd25
font_01_sfnt_off000103bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 17432 bytes
SHA-256: 9daf5f23d732df652fe74121e2625fc6b48bee66c3206b542024962efb32db7d
font_02_sfnt_off00013169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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