Malicious PDF — malware analysis report

Static analysis result for SHA-256 142ee114607560c5…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 15:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d99f4fba581c92eff7b5df99788e1465 SHA-1: d8378e8914637728ce1191f3437b8177d7c39abe SHA-256: 142ee114607560c5ab02c7f446b9fbd591757598f9774b34bf9cbd9be11865f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. The presence of embedded URLs and link farms points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://huntic.ru/uplcv?utm_term=construction+simulator+3+download+apk PDF link annotation
    • http://twozonechickenlasvegas.com/uploads/files/40530814615.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/ninolelikilovolaror.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/b3u8uq22kotdjfr6hh0kd7mpdr/96993523283.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/15093192715.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/loruna.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210922_031528.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/xupiregofogop.pdfIn PDF document text
    • http://emeat.ru/var/files/75773295174.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/7aad0749be8ed15da2c604b4d83d2aa5/30211457863.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/wuzigazonodabogexevite.pdfIn PDF document text
    • http://goldmustang.ru/files/files/66581117091.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/mapobobufugimezalev.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/sisozenenoj.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/jipikaki.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///31436485955.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/sujoxusifavajanonofuri.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/79059835453.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/finotowika.pdfIn PDF document text
    • https://swiz.eu/files/editor/semazopiwodilajix.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/sexevodumaruzibazawezin.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/b3c9e2e49ebd6a3c70a1b2de2d545373/54304499982.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_off0000b017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB017 11024 bytes
SHA-256: 03222e699a55bfec1efc20e090e185c09bfb021acdfcec7805c597e7702d4658
font_01_sfnt_off0000c9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CD 16184 bytes
SHA-256: d38d0532bc5857ea4d54651c191e7bd339b6550138f87b42a653b64c40301ebb
font_02_sfnt_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1