Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c5e1de348a4512…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 07:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1f11771d46188be93b8abc868604e690 SHA-1: 0c8fe465a0ad754ecb1494d1e913af7412f3d987 SHA-256: a7c5e1de348a4512df42d9fb57cbd9bc24babe8313dfea021f0025190c75e7c0
196 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of numerous URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pistant.ru/uplcv?utm_term=onitemselectedlistener+spinner+kotlin PDF link annotation
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/nososema.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/19143339873.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/jorekewa.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/volubejapo.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b2d00145---69092708776.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210910192618.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366586d9a54---narorijil.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/nizokofarakopunob.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/bunifufivorufolokarexil.pdfIn PDF document text
    • http://effektfilm.de/files/file/37993569588.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/foroba.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/jorerunawazaved.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/gonubibalut.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a30a91bb4---73639831376.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/wevoderirodita.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/47723843440.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/7981924397.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138105072b91---56986011975.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/96902988822.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/5109060761.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/wuwonujuzubebepifozof.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/kudelaxemuzojuxobejifev.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/vuwilaxagimefuka.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_off0000c2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F2 10632 bytes
SHA-256: 23b29fc0fe52e90d32713e11de87e653fdb1ede19d321244c920bdeea15c1252
font_01_sfnt_off0000db45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973
font_03_sfnt_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 20428 bytes
SHA-256: 97b72c8304a38c97d3daa269a0787cee1624753e82f3e58e38ea3f89446e0585

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