Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4848cb90d2efab8…

MALICIOUS

PDF

75.3 KB Created: 2021-09-18 11:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 90e49678339a710cc412ac1a1c112c36 SHA-1: ca773e9a5516a4176895de7c4c9528995b548f1f SHA-256: a4848cb90d2efab831e5cac5b1ccbf91b69bac5507f316ebc322d1e6cd74ade5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://garglob.ru/uplcv?utm_term=forever+by+gyakie PDF link annotation
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613649655965f---jisamejanifisepidi.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/1176970116.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/45861761824.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/fowubobobor.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/tumibefobofesawowusa.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/90101693551.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/82666101913.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613023863e86b---zewugadonuvedefifogawomet.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/86264725194.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/duguweradidepurilenerozex.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/pazezemuke.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/91359558036.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/mawawosubaxufofusujame.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210908_091830.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/47274428686.pdfIn PDF document text
    • http://lovesenergy.nl/file/72304588777.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1b85e3e38---lijevarafoxagimimokadat.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/5b01a8d2b292732c1f3c7bce1d724168/43132177658.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/18271795850.pdfIn PDF document text
    • http://saktigroup.in/uploads/paleratipivinazojagavuda.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/51127327235.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/13814213117.pdfIn PDF document text
    • https://adci.vn/data/upload/file/88964610428.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/gilofirokurobokibofis.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_off0000c128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC128 18124 bytes
SHA-256: 73ebd434085e39772c202aa7b160e8378590e3a8ff67429292f655d4454182cf
font_01_sfnt_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 10256 bytes
SHA-256: 2ab80741f7f14eadd40a5c07c9dde9c45659fad633b2a424ac94d3e121067564
font_02_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1