Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef6b4e7a0a89658…

MALICIOUS

PDF

106.8 KB Created: 2021-08-02 01:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7f03df818da7ac22a93cc831ae4a348e SHA-1: e2cd761bfd780569a692be013e1739cd8dc24c6d SHA-256: 3ef6b4e7a0a89658cfd9cdbcc5e62563fe4d059d7e2bcf4f17324834e47ff55b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic findings suggest the document is designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://chcial.ru/uplcv?utm_term=best+video+editor+for+windows+10+2020 PDF link annotation
    • http://mpu-beratung-brendle.de/userfiles/file/zugekebogap.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b49b29e1b99863c559e99829e683c7a4/77820428523.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/402c654164d86a4b9333d58d6047341d/betesowisapoxo.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/67555998372.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/tevabudisigap.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607102c46b4ec---tifotuvikasenuzude.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/kopigatekawugefarofaxa.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/serewivupofepifolakog.pdfIn PDF document text
    • https://sanidom.pl/img/file/zalawofef.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/20778112576.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/68252944347.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/kozaso.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/7b5dba4fdb06b6b9c6a9be7d36118cb6/88460687281.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c781ed8ef45---foxeme.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de85221136---nimeru.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/30244709024.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/70007901353.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a436111ce958f2af4ca24e54d7da0289/54387735009.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6ba648d81---legapebosabej.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/99036479762.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19ae0040b4---lolirabadevadolupupi.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/22974388584.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076088150c99---nekozozebipokexalikoda.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/xemujigebipurinavijife.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/r56s4n3v1sgctqjdne91asu64t/73675913271.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/09355dba1bc81c8e451dc2874d994e3a/sefuzagoporojikasidibopop.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001353b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353B 17844 bytes
SHA-256: 7a9afddaa98d0d662f0a3140817a6d020e4771f999c5f505ff1ded54de77a5dd
font_01_sfnt_off000163ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163FF 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_02_sfnt_off00016cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000184cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184CC 10636 bytes
SHA-256: 5cb30dd34c61454896677e45da1ae591e0be85bf131f8d32c750d06e81516563

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