Malicious PDF — malware analysis report

Static analysis result for SHA-256 0781b4923ecbd1b6…

MALICIOUS

PDF

85.5 KB Created: 2021-06-27 11:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf7377c3b54983bc13b73ef0de44f3ee SHA-1: 512f8699b608cfb4e677a107eea884c68c50260b SHA-256: 0781b4923ecbd1b6c67cd857fcc758ec4eb7861583e1996f2d78686248941e54
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which appear to be compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the link farm structure suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://crewmak.ru/uplcv?utm_term=cute+sayings+with+the+word+pink
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7389f78b---mosuwavaz.pdf
    • http://bmsorganica.com/userfiles/file/29269542247.pdf
    • https://stratasphere.online/userfiles/file/takudelubob.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/tugeredepedeladeri.pdf
    • http://asiadomainstore.com/userfiles/file/35422675095.pdf
    • http://eltonltd.ru/sites/default/files/uploads/53696730623.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cce86f3056---50452579110.pdf
    • http://shannonlakeestates.org/fck_images/file/netobenisanelat.pdf
    • http://playeasypiano.com/resources/fck_images/54220814520.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078f1ac52851---jowuju.pdf
    • http://kistours.hu/userfiles/file/kipowotutun.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/vegobozilubotagegobefefun.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/muxulowujevexuko.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb30f839013---lalosimodujepolaxufet.pdf
    • https://ludifrance.fr/userfiles/file/30280524576.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/i9a3ti9mjqrjqgba7cmh1p3sb7/muzobujowikil.pdf
    • https://hirurgija.me//files/98470853705.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083347ef1cfd---makuzesogamogatis.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/0mqeobg83foi8lovng1rbocsfc/40057058681.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7c7262bd4605edeeac87f55c23d1dece/pagesi.pdf
    • https://healthmatters.me/userfiles/file/38528716633.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e98d.bin
feb5aaab8241da4dcb1677cf6aa4892cdc05e81cdf939d7856192a9810e31211
pdf-font-stream PDF embedded font (sfnt) at offset 0xE98D 11048 bytes
font_01_sfnt_off00010328.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 16792 bytes
font_02_sfnt_off00011b3a.bin
a22ec8285f7460fd0bbd5d7cd67773cccc73b4aa8598aa102c5d37c03ecf1af9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3A 17080 bytes