Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73dc8f84791ae34…

MALICIOUS

PDF

95.9 KB Created: 2021-09-18 10:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af43b22fa86e664534df92ea40c30526 SHA-1: 797a78b3011159e04f1e7ce647ac4d82b26dab49 SHA-256: f73dc8f84791ae3468225568ea9754690f398ea8c909b80934e6b6384e453e47
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=warhammer+40k+8th+edition+rulebook+pdf PDF link annotation
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/78022700702.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/eb99d797e9172ebfd23e875d8118f981/64353527830.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/palowoso.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/89968598973.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/pojazujixofutide.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/11756583032.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/lamafarivugupeligapagiga.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/7cad129478fc706f30c4f23222d68315/fikixajixujuzoxulekaxuva.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/jizema.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/26703983778.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/62755009342.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/33681777719.pdfIn PDF document text
    • https://www.dtd.com.pk/ckfinder/userfiles/files/xupijojijagiwubilapuz.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/ruwutid.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/67987507273.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/toruniwomoku.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/fipapenimipimaxuwogoxare.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/kvp1eg569mf1h9gaicsevl5jr3/jewufamukekitawoxis.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145037ab7989---vuvuwabijaxif.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/78773576514.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/begito.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/98496457352.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/kifufafololoz.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16140f306ee613---63104470952.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/60540034290.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/seloxokixazejimasoxezolo.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_off00011026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001283d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283D 11328 bytes
SHA-256: 730bd95b7b57979e396b08193a6b3f556e7d523868ca34017cf55767750fdb2b
font_02_sfnt_off0001427d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1427D 18216 bytes
SHA-256: 2ef984ee802e75e1d6b879885bc5e4ce3bbe46849869a6cd0c18579e0448c7a2