Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4715be368fdb0a0…

MALICIOUS

PDF

88.0 KB Created: 2021-07-04 18:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a27a54033f57972193305f6aada4ceab SHA-1: a8bf5dbf74802e7a7fbb91ef505dc81d241d735e SHA-256: f4715be368fdb0a06a57972c18098d947a0f167d4c9551655f76f7ed91327393
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm, directing users to various compromised or disposable hosting sites, including one with a raw IP address. The presence of embedded URLs suggests an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nbtele.com/en/cache/fck_files/file/55650628773.pdf In PDF document text
    • http://pileshoppen.dk/userfiles/file/putuviruz.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/dedizopoworovamad.pdfPDF link annotation
    • http://altinellerinsaat.net/UserFiles/file/dajamaweganifufekafapupo.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/8cfea7a4ad9d15403d0c560cb0663838/vafaxolijelejujot.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6edb171490---84819444797.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/22987952778.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c696e18ec4f---komesivijupodavagow.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/5394550826.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a868e141e67---57427864647.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/fjeti4deinupimjfrvcipdo0kd/85317250041.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608db6e221e58---xobuwujamepodiko.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/19de24cb27e908d741e8a05284eac25c/73004180332.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/gunawipuxaxivup.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d9b00ee0b---mizixurere.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/e128cf04607f4ae115bd5973b8498f7e/43615160481.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d5de6a8e4---18659530022.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609143b6426b0---samiwemu.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/99456815769.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4425daf35---ledemuf.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/80590425660.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8rups9pu278brkq760bjp5hfu/63907995672.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a832d90f8---40578713117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+connect+nexillumi+lightsPDF 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_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 16500 bytes
SHA-256: 8a3359c4b008e950f073c29f5c7094564c10c6dc4a6e33074c56bbdf58c9370e
font_01_sfnt_off00012094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AB 10692 bytes
SHA-256: 4eaa9097a7f385c00ca099f319f0daa3f921eaaf03b215dcdfd50bdd0cb05d80