Malicious PDF — malware analysis report

Static analysis result for SHA-256 e07a13b93eb03ac7…

MALICIOUS

PDF

84.8 KB Created: 2021-09-22 20:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d3a80fa6821d5edb2369faee4784287d SHA-1: 3c72759589a98ccb159af260ee490bd6cea7c691 SHA-256: e07a13b93eb03ac7e2a7a007b8b4968381428ae42c35d43921f0c17d9ff23d0d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, redirecting users through multiple domains, some of which appear to be compromised WordPress uploads. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=cooking+on+a+bootstrap+recipes PDF link annotation
    • http://zxpgw.com/userfiles/file/43049389841.pdfIn PDF document text
    • https://mar3ol.com/Files/files/japabuvibekesigejidipepe.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/xadiwulesujubepub.pdfIn PDF document text
    • https://masihpt2.com/contents/files/mupusola.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-19/20210919180214599342.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/28866748738.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/66340022135.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/87028736725.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/jijofu.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/63970872439.pdfIn PDF document text
    • https://sambelteri.com/contents/files/sapiwapamewofesegipa.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gutamaxurofumuxabo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2f1e7dd29---gigabebiba.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/mokefuwilokizodebitil.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/11903527102.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613186f1dc899---safafuxe.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/zikajogisekuxutejosenaki.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/panezajapo.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/vaguzasimu.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/sixox.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e398f239---pexodazafasosivarobezezib.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/wipetibesev.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/serokodemexajepotamemux.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/lizeg.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb06eea3c4---xukukoniw.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/1445116913.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_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 16628 bytes
SHA-256: 15f5ea99fffa96620780f4348fd0b19af3f2249cec3b7b7d7b5c1b629d904f1b
font_01_sfnt_off00011471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C88 10768 bytes
SHA-256: b98ab82de0a909e153eb086810f3dcd01d1f212a0f7f3e6c20aedcb51c00d3cf

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