Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a108243aee89017…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 05:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f87bd44fdf614fdd0259e9fb77edf8c SHA-1: 78a441d27d61eae367915e7056f16977a9146a7e SHA-256: 6a108243aee890175399bdb54a109efd1d3a45da3b0c55e4884b68cc954e9bda
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing campaign. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading further malware. The primary attack vector appears to be a spearphishing attachment, with the embedded JavaScript potentially facilitating the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=skyvpn+hack+apk PDF link annotation
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c520731889---davafatumuxob.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/15017777817.pdfIn PDF document text
    • https://hotelcorona.ro/files/74076130244.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/73392435542.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/ganaduximazuno.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/90325986038.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/54463498629.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210906082358345.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16146a50dba79f---4278010743.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614085beabde3---vadevuruvapapekewomexo.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/wufawulejekareruka.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-1/20210901115349281718.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109091257094143.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/pebolamajiwosirera.pdfIn PDF document text
    • https://defi128.com/userfiles/files/pudidewo.pdfIn PDF document text
    • http://ruihuitax.com/files/file/26378229825.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/denugizevuwavolupolorawa.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467e0edbe94---15205794050.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/3279406452.pdfIn PDF document text
    • https://ebooksweb.net/files/file/65105707589.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/98547265552.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210908_043027.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/nagapetub.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/fawulilip.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/mejupuruxeded.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/rajese.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 17672 bytes
SHA-256: 12824aeec4b5d06818114b7932b4655b330089e733245ab66f8faa7dcd5fd4f0
font_01_sfnt_off00010ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC6 10060 bytes
SHA-256: 0751e2be2b24eb31e8bb3bfc8de930f9682d44f84d217bb155952afc36a5fb30
font_02_sfnt_off00012523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12523 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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