Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfdf11507c5d539…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 10:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d76424f9412998395c128782b72d58b SHA-1: f78db82b489a6929f6096ba93227783bc7777bec SHA-256: 6bfdf11507c5d539fe453e5a23e12a36c0d2e1896622c03c39fce3f85728c714
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to websites that appear to be link farms or hosted on compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and UTM parameters, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of multiple links to compromised upload directories further supports a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ansonseatery.com/uploads/files/74934045611.pdf In PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/32758730908.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/6639199956.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/wesokiwubetuv.pdfIn PDF document text
    • http://enewind.com/pliki/file/bugelumogularowagu.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ac1cc932cc9d397b8af15e9796d698f6/tijesoradodade.pdfIn PDF document text
    • http://njchemland.com/upload/files/jomuzekeroveretilipivimi.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/84572606877.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/rigaxurosogutot.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/80419003408.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/77591266938.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/takifapotuzimusiwowapeva.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/001eaf1ce67a40300fe7cc47ac22ddf5/53604075766.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/55048780259.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/gidimatutugofujuza.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/73605032686.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/ximorigilafigug.pdfIn PDF document text
    • http://canadianrockies.info/files/file/botofubizoferon.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/28522174866.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/87538915258.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/kunub.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4d6cd9f52b3d39d225de56af606d62bf/tamukosudurofijaxipizirup.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/woxifukaxanip.pdfIn PDF document text
    • https://primer-spb.ru/files/files/wakirotefaseso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=lidl+home+apkPDF link annotation
    • 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_off0000e29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB3 10236 bytes
SHA-256: f277250e6c7a86537ed7036bb24a363ebeb2d101420c71ecd98de629dbb51ebd
font_02_sfnt_off0001118e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118E 18120 bytes
SHA-256: 7f6e823bcc6d763d2203076c4f93a18bf0eb68f15f552d433a9e0fd87b9ca278