Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd073cd383afa30e…

MALICIOUS

PDF

85.2 KB Created: 2021-09-15 13:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3893213b1a4efc1138492e0bd6d2585a SHA-1: a82c1bb40e93aaa212e4a79016547d61752730ec SHA-256: fd073cd383afa30ed884f751c402fb587af1c393f43093970b8630e9843d163c
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to potentially compromised or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide direct clues, but the heuristics and URLs are sufficient to infer a malicious link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=555+angel+number+romance PDF link annotation
    • http://talesma.com/E/file/nafopudoluzos.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/61143144069.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/genurojajopelakudubodo.pdfIn PDF document text
    • http://chromavials.com/d/files/woxalamufofap.pdfIn PDF document text
    • http://i-physiology.ru/upload/kuvome.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/48027676531.pdfIn PDF document text
    • https://istanajp.com/contents/files/13698954727.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/tozuz.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/61117866422.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0997d3447---37316312705.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/cda1816783ad36ef97e7677c0ed7799c/muwisilegogimivipokubajon.pdfIn PDF document text
    • https://olterus.net/contents/files/72419900645.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/10547969966.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/jawadalopufadapu.pdfIn PDF document text
    • http://anm-av.de/uploads/files/27577765202.pdfIn PDF document text
    • https://tuinvandecruys.be/file/rawadedopefowenasivo.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/d79eh1j9unta1u96it4b26lra5/50858845202.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/tiwovadeja.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/35200669860.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/43755174064.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210909051751.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/waviruxuw.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0d9d5feb1---xegozuzob.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/pokowaza.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_off0000eb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 10492 bytes
SHA-256: ece4533fd3e322f16c73eee090b67beaaaae78512acdb8f5d5096e965fd6600b
font_02_sfnt_off00011af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF6 17340 bytes
SHA-256: 39ccaac0afc7cc11746da4c447dec9464bd407baa0702c2c72a91f9ae398adf0