Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03d95a4e62d1f4a…

MALICIOUS

PDF

85.2 KB Created: 2021-09-21 07:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19aa3d6e591405aaa08d26612e720ee5 SHA-1: 54376561f051ab18357ef87d2289866cc33e926f SHA-256: a03d95a4e62d1f4a60fc4f3c8f8dbd68c225ae02a26225cf0a3305e7d81d0b6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to various domains, some of which are compromised WordPress uploads, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious content, likely for downloading further payloads or phishing for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://deniz-sogutma.org/img/userfiles/file/52411018860.pdf
    • https://aprilboya.com/userfiles/file/wejeme.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4346dd6a8---77753676174.pdf
    • http://dellalontra.it/userfiles/files/47555921269.pdf
    • https://areopag.ru/sites/default/files/uploads/14914880985.pdf
    • https://idd.no/ckfinder/userfiles/files/98613155584.pdf
    • https://vinasimex.com/uploads/file/52663564272.pdf
    • https://contemporaryteas.in/admin/uploads/file/26248959085.pdf
    • http://vietdubai.com/userfiles/file/duruvuzumaburixaparape.pdf
    • https://brillimet.com/uploads/files/202109080930268545.pdf
    • http://fruitvita.com/files/files/45502613364.pdf
    • http://regcureguide.com/files/files/39385312046.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fcb8b9ecb---82256136444.pdf
    • http://romovi.net/sgi_userfiles/userfiles/files/53618388505.pdf
    • https://bleikss.com/userfiles/file/21920378860.pdf
    • http://aalzkj.love-mrt.com/upload/files/xetuxabajagowamabiref.pdf
    • https://km2804.com/ckupload/files/fazipoxom.pdf
    • http://www.deco-interieure.com/userfiles/file/52418602175.pdf
    • http://tcsklife.com/filespath/files/20210912211531.pdf
    • http://aligokdemir.com/resimler/files/jojodilinoteluzopamazene.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb711dc4f7---vogizalidiluvikezisoj.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1e77c4d0---46230809013.pdf
    • http://goldcoil.com/uploadfiles/files/2905362843.pdf
    • http://bamboomfi.com/htdocs/cljr/data/files/1864707981.pdf
    • http://esejsc.com/upload/files/77576947735.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=snaptube+download+2021
    • 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_off0000e829.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE829 16792 bytes
font_01_sfnt_off0001003b.bin
b598b6817f3b8d53c28e6db19eff0bd53135de6048912619dd7b7f377fc96f75
pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 17972 bytes
font_02_sfnt_off00012e84.bin
93207d3fbc764b90a77a0c399bf3749b2e9250e617895cfaae4b8f0de48af7d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E84 10720 bytes