Malicious PDF — malware analysis report

Static analysis result for SHA-256 075658b459d36c1a…

MALICIOUS

PDF

92.4 KB Created: 2021-07-01 13:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e4f2c7831c3326b1435938b07a10b3c SHA-1: 73c934014a77f52cd6230d826efa220890d4a774 SHA-256: 075658b459d36c1a884f86882853be158b2d48036d0eeb8d11d29b7225a3e816
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm hosted on compromised WordPress sites. Multiple URLs point to PDF files within form upload directories, suggesting an attempt to distribute malicious content or redirect users. The presence of external URI firings further supports the link farm characteristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160719f4883a1c---rekoleresojusulu.pdf
    • http://shuswapladystriders.ca/userfiles/file/gakozokimipa.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/af0a2087dc7667a6bc16565ad29b6f49/paboxebunemorememuputon.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c1bd4215---limopuvujor.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160942f62af9cf---4589080518.pdf
    • http://menafundinfo.com/userfiles/file/lezutifi.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf50950991---76272964770.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16081dcff58c7a---notoviguveruz.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/g45kcrfpol85vd4bcdh5640vbn/44029170500.pdf
    • https://lapiadinafelice.it/file/wedamuwuzabivawib.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/uprfc7c84l5t44vj5d454428b7/22568476795.pdf
    • http://openendrep.com/userfiles/files/38183962290.pdf
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/posipepinusuzawojomad.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f1839baf3---95468271908.pdf
    • http://polkovnik.su/upload/file/46411151224.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a872eaa7c5---xobakaxa.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/3al2rjhsq5fsdq4rdkkmpd95ue/93744431992.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/suziponilamudam.pdf
    • http://www.asslar.de/downloads/89561812613.pdf
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/lumefapodewifuwijamopakok.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a212762ac---76410339807.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/mmetqe4022b12lc3sviuho3h21/51805166218.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb21e7eb17---76296408816.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8ee09b2e1---vomenewiderepapogorejed.pdf
    • https://creativitagh.com/pevron/www/img/file/bidiguwenibezulujapu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hcl+percentage+to+molarity
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5aa.bin
890db04d956e037ed18917126a8d08225ac696230ecf0191d127d5939aa8ad74
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 10656 bytes
font_01_sfnt_off0000fe07.bin
5bd31590dfc1b1c2a068e8aecb694ade09c44cc6a61a78a2aca11a4b48785b8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE07 20984 bytes
font_02_sfnt_off0001349a.bin
9cef2ffea0176b79a931011e80f2c274dadd53f4ae229defc0172f2a9a07df61
pdf-font-stream PDF embedded font (sfnt) at offset 0x1349A 16532 bytes
font_03_sfnt_off00014b8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8D 16792 bytes