Malicious PDF — malware analysis report

Static analysis result for SHA-256 1580dab3885e9e49…

MALICIOUS

PDF

72.9 KB Created: 2021-09-16 05:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0d06e6cc397c0d4741fb71542f08959b SHA-1: d50ed800c63a460eeef045ee225cebad44ac7dfc SHA-256: 1580dab3885e9e49c7b1ce65f4a1a23b69b25dffb9a60d3c010d0eb088a2da6e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like nature. It contains numerous external links, with several pointing to domains that appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a link farm on disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://irollee.com/userfiles/file/66064088250.pdf In PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/vowoligodexuron.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/pukujibuzuje.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/1221912830.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/85291385354.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161348749d1b47---xodelanivilejej.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/37933032732.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/teriti.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/filijojemenafatiwabamof.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0b8aeb1c4640ff356d4ff185b08a0f2/1411726694.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/tidonedogifomufugero.pdfIn PDF document text
    • http://hevolta.com/upload/file/fadepuwajabewegav.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161374976233c0---zurozagugarofamibosegetuk.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/3522866611.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b29b2c90b0---35110084109.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/13722582618.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/xifasivid.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/2887345219.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae4b15ddb6---widotabinugo.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/buzumazogugaberozomusufal.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f108b68e8f---refejafi.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/tunir.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631322203.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/92126963012.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed8aa15b52---nesexuwumutuxubunexagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=old+st+mary%27s+cemeteryPDF 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_off0000bb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB26 10388 bytes
SHA-256: 65aacae422a66f24d38a0ab35b113ad93e522391b8626cde5079ca34f84ddb1b
font_01_sfnt_off0000d2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D3 16636 bytes
SHA-256: 8afff7d6e330ec89cf09039a9e7cc135d540ccb1ebb9d47ecf10df5385594a38
font_02_sfnt_off0000fd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1