Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f4a3cfc072e1d0…

MALICIOUS

PDF

83.7 KB Created: 2021-06-25 22:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db114bec52cc281d9e6f0ca40e73ad76 SHA-1: 6ff88f5fea13a262c2a09c9cb50ecafce9dac3fb SHA-256: 44f4a3cfc072e1d0ac2f88ab1d2d841dd9bc7bbd4ff984b31e604a17fc708dda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links and the overall detection suggest an attempt to deliver a malicious payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://garmagostaran.com/Upload/file/2469389206.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e2cf26c7b---41667497762.pdf
    • http://www.aadhar-interior.com/userfiles/file/19846903899.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070b9e4dd135---26657238063.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/litupomomerunapupojevidar.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/58mtf06odeqekropbftrqaosm4/guloxovovopuzu.pdf
    • https://espaciocultivarte.com/ckfinder/userfiles/files/vubifobezusolunavusakat.pdf
    • http://canphantich.net/Images_upload/files/35155264559.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/xajunusilimojekugugebol.pdf
    • http://sieuthikhoacaocap.vn/upload/files/93668860294.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094842b41334---3691590542.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/744857d984d574d60d03b55d8df255c8/gowevakedudejit.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/7cadeb24b8987beb1d852565dd1bc5fe/riwegipifap.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b7186580e---58848871676.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c64b0c8c8db---megekijawiwotuzad.pdf
    • http://csc028.com/userfiles/file/20210610024849_cejumo.pdf
    • https://htddienstverlening.nl/userfiles/file/92025356321.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61f06abed0---35968760658.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/d2ccea8c8ea1581370da12066c4f9adc/87326662380.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c437e08663b---gixawiriwukolugewo.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/hrnd3hp0a984euuhcpr17fv0i3/55804244658.pdf
    • http://nakatka.com/files/file/90490878461.pdf
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/86781841119.pdf
    • http://aarogyamedico.com/userfiles/file/tuvazemimitexinokowu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=watch+the+neverending+story+online+free
    • 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_off0000e20b.bin
7149213efeb57ff0d27b2310235c052501296bf10b5517d77930debf72ad4dbb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 17664 bytes
font_01_sfnt_off0001102f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1102F 16792 bytes
font_02_sfnt_off00012846.bin
aeb99eb28a9d29d9c59d12edcf3a913622fd2227470f5c5ae1fdc138ccc49455
pdf-font-stream PDF embedded font (sfnt) at offset 0x12846 10928 bytes