Malicious PDF — malware analysis report

Static analysis result for SHA-256 338d74d2c4b5ec4b…

MALICIOUS

PDF

80.3 KB Created: 2021-07-01 19:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 100c270e989a5cd1504c2cd15655cd56 SHA-1: 7533aabb821ef21a3c1337eccde92b8805c04234 SHA-256: 338d74d2c4b5ec4b75165a39501cd62e20940167a72947176ffae97afb1938e3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/4dqdtg90ijsmeg201noiqdl0tk/2806280049.pdf
    • https://kovosluzba-praha.cz/res/file/90023968146.pdf
    • http://serdceprirody.ru/userfiles/file/99543359300.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a92fb72a40---73678429952.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c159dcac407---fasawigifoliduvem.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/9kf2dt5n6tf2q1rddhob51d169/kudamorevagemedajawa.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607802be415a6---10081785496.pdf
    • http://deshdunya.com/blogimage/file/39850802528.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/4f77eb0e48f7687e43e4243ccf4f0d72/wagufugomunatewerurikimu.pdf
    • https://gyn-koe70.de/obrazky/file/nixisebaninuseputifuti.pdf
    • https://majorsagilekvaros.hu/uploads/file/fudopodofuvuworijesug.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d987b97c3c9---49894217047.pdf
    • https://pointvirgule.ca/upload/editor/file/ganibudikuzafoposimenese.pdf
    • https://morabia.fi/images/file/59157099703.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/b1rgmeootdh5fq1oon9o13ideg/dokesulasekusono.pdf
    • https://cgeminfos.ma/upload/file/7679037465.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3ec81529a4d9604234ac9dba2524eec5/jolexuboxonan.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8du9vblh6mbftorv398nlrdq03/22188473779.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160794ff458c31---kugako.pdf
    • http://s-privod.ru/userfiles/file/75788434582.pdf
    • https://srmhospitalities.com/images/bulk_images/files/jujejazemurexifow.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/abadh5vdkciseinqlvijq72nod/4540845148.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/64987098762.pdf
    • http://meteosputnik.ru/userfiles/file/jezamal.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/sekuxi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pictures+of+various+farm+equipments+and+instructional+manual
    • 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_off0000d4c5.bin
8a062c258bc809bdf920d6ba106a6815cdacf4aab728bbaba6efa95e32264f4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C5 17204 bytes
font_01_sfnt_off0001018b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1018B 16792 bytes
font_02_sfnt_off000119a2.bin
5b0e7cd431c289fb86de4ed3842088127466f7e3ef291fc1e3b2e100a53b5eb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x119A2 11096 bytes