Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10c1b83cfbd8260…

MALICIOUS

PDF

98.4 KB Created: 2021-08-02 11:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25cd20e144aef8205e92347acf74e2cd SHA-1: 50e8c9906b341cf2de6ea858c6bb8545ab7aecb6 SHA-256: a10c1b83cfbd8260cb509c8421c89655a00b879865d1e6f27cc5518497d1578c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised websites or disposable hosting, which are likely intended to trick the user into downloading a secondary malicious PDF. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure suggests a link farm designed for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/dba3430b4d5cb281c0613a987ec59b21/21398052179.pdf In PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/kasov.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/tlsa3sk917adaq9cs07t3gv5bb/folojovutowimisovegi.pdfIn PDF document text
    • http://matras-devison.com/upload/file/70488174854.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/75qovkk09uva0kd6uphg84qpk6/51763044345.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/juwitozurasid.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160943604c1aba---xolatalevasi.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210528200856.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/lasunexogojiwudaresilu.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f5e12c7a---18384600276.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/b0943c1ae9ff89532229323a20685b78/71789978536.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/8759856473.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/802d45593621988b5a5ba67921419a8e/75470473805.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/pogonodebipipepetos.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/vopixonup.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/65678752538.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/227084523.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/c3b6966db3031ab8d2bc3de54e51b778/xufilera.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/kavesumoxubomaburu.pdfPDF link annotation
    • http://szentimresiklos.hu/upload/file/47020890215.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/leziganonasipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+do+you+stop+piriformis+syndromePDF 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_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 17188 bytes
SHA-256: 38afb36dc4dd9cd217bb0010673df0c43f498ff9dec633b3163ede633f025670
font_01_sfnt_off00014a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001627d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1627D 10740 bytes
SHA-256: 36c7edc08c1622a14d53444ded8f61270b8d89b126e59c1ff76619fcf641992b

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