Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec17506a267948d1…

MALICIOUS

PDF

83.0 KB Created: 2021-07-31 01:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43b215539972e670a41fc80b0c61f551 SHA-1: 44271e00f6baf0f5c3c9b73efc3929f98569e37e SHA-256: ec17506a267948d1af3ac75c8521f7d07a84374893d1f6dd0295529f43ed6a57
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The document body is unreadable, but the URL structure and heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e986751b6---10628122402.pdf
    • http://diamondsnspurs.com/clients/12200/File/3721370782.pdf
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/30074336603.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609083ee3e3c3---bozusimerevi.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dc08789a47c---1616774149.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/muroxufidijojo.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071996dc02ad---segemekedezu.pdf
    • http://broorybulldogs.com/clients/33993/File/tabejenova.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731eee67b23---81782518423.pdf
    • http://driver-jazda.pl/upload/file/tukigu.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf0124da06---2858469022.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/shu6gqo7fihc9tq13h63muludm/feturutisuvuzokogur.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/83236491482.pdf
    • http://shiokuda1.com/contents//files/xefukamarosusixef.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/a2048c4e1072c0123da16dbf076ad96b/88344223120.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/drun14kc80feiiule9nifi21jp/35448394943.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/81376cf8164f8171e209e52d43ecc081/82584177211.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/4nlpkh3j37u5b96vg952kkkef0/besiridowux.pdf
    • https://lacecinella.com/writable/public/userfiles/file/nimigugi.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607a999bedd91---xisemiguvopepidaxarem.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=tamil+thiruttuvcd+hd+movies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c0.bin
066ecd3479cc3553cff0404f6158dffb83f7a89931b0cea3918dadc31a841e0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 10660 bytes
font_01_sfnt_off0000fc33.bin
6e1ed491f74dca85e50c779c35124018ebaf84838ae0475abbb1c4a73c7daa28
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 16584 bytes
font_02_sfnt_off000126fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126FD 16792 bytes