Malicious PDF — malware analysis report

Static analysis result for SHA-256 131e940129503c60…

MALICIOUS

PDF

87.8 KB Created: 2021-07-05 18:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4b16edd5d4cf2d988fb93bc327f3c02d SHA-1: f0d78752e7fab1ce6d0e800a2e53875ed05daf6a SHA-256: 131e940129503c60a6b27c180cd5a107b01dad891ae8bb11a9015b790a51ae30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ea416a5c---42320170368.pdf In PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608d27e3c4146---sitebikigubejekeso.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210702_A8E22A2BBD4E2F9B.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/nebeki.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/94126391830.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/d1ee3f1d42b7ad99c5ab2b0dd39bb39a/66486283485.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/sowodikutizuvotopusil.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/31178202686.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/gudebubemogafujuwazo.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052116545970554.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/5lfmunb2394oftbbqufn1ai5pp/loruweguwopurune.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af9d25151c---28091428422.pdfIn PDF document text
    • http://trimblehighalumni.com/clients/84492/File/xogezomuniki.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec96a76562---4914774300.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/ldheo9qu04vb75rmle30pemeie/24543673415.pdfIn PDF document text
    • http://changdahk.com/upload/suzolezezegevuzebi.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2b6755cc---gobozurovul.pdfIn PDF document text
    • http://ruresept.ru/files/file/femusurozarumatufusemini.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9c62ec776---20920835250.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/pilefenonofofogurotokenep.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/fujelipaniforime.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9fcc91c15516ee49b1127eb0095eac2f/tabuniwof.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/df08314d9ed8609d3e84a7dcb97c537a/8831462551.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6g3j4ntugs367nkojr3nhr2510/83527857496.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608059a7e70c9---74957996885.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/42fc03a04450fc5f03b262e2719558bd/56611726759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=torn+ankle+ligament+recoveryPDF link annotation
    • 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_off0000f69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 10640 bytes
SHA-256: d39964138eae9646123caed14a501d11c43bbc3352ebcf5026b0124f6905244b
font_01_sfnt_off00010efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001270d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270D 16472 bytes
SHA-256: daa317a9586dea2219f6a4cce83c30089eed9071baad6fd258051f0b03fc908f