Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fdb30945364921…

MALICIOUS

PDF

117.3 KB Created: 2021-07-26 10:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 51840bd7a63f7aed6400ea8b9d20b237 SHA-1: fd68c7e3099f885232bfe031cd6387c851111258 SHA-256: a8fdb30945364921ad088e9147271089150989b19898efe2e82c6bf1648f1829
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the detection results point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://adabaskimerkezi.com/upload/file/zuxinaw.pdf In PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/29166386004.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5f816ab44---zetajaliwoxerugi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8hgn586od6l8ajn4b92ddiqfs7/kemon.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/jesevolivak.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/51820596609.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ml8b47cmo7tgabig8jih7bfdlj/wijeji.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/fuvorij.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889fe776edf---89408522631.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/gezavunesadup.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/20172559670.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/90174005270.pdfIn PDF document text
    • https://ebooksweb.net/files/file/gujovixojiz.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3288570960d325f7829a4b10f57fe650/senupanidubowum.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/zaxax.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/6cq9gotvs0ls8b9fpqr45ehnhq/83290236161.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/97649834843.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/wujubab.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/95132047645.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c74b89f29---49360788318.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/1fc1434055de558d786c2f3240655276/39282747849.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/3eea6d5a876a4633e78bf650244169ac/zuvewumunabitonut.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/35459891661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tc+helicon+mic+mechanic+2+manual+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11579 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_01_sfnt_off00012aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEE 16868 bytes
SHA-256: d46f1923a2717e971d38622dd432fa0121f64821cda7ae09c014c71953d7f2f0
font_02_sfnt_off0001570a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1570A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F21 10700 bytes
SHA-256: cbc8ba4f4d1855d9de52a3bd553c4bc04300f685fd6595fc9839b7f0086c1172
font_04_sfnt_off0001876d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1876D 19488 bytes
SHA-256: 6a3536f0b015c5440ee9f534abb9a5273c6a4c5696a91866026c27f39880811b

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