Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4b06b36d3512b2…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 22:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a760b2b5390598b7b9c0c6fedc6e029c SHA-1: 74062f77869be498794dcfacef94b30d14db4652 SHA-256: 6d4b06b36d3512b21101f8cdda8d9da294c752d0e9bcfa7c5f8cd6dd3c8560d0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the presence of numerous URLs, some hosted on compromised CMS upload directories, points towards a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://maristaslardero.es/userfiles/file/delojokijofotoxitiruj.pdf In PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e1d18ec567fc6154e45385d4c6b80e41/masekisakonit.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116e43340264---jezisovedufadolu.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/bekematofamixe.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/gojigalofopukut.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e94ca477---661599344.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fc909845c---lenegeragemenizukamasosu.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/21690223564.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/61964994883.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/67929167447.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/xuxugibajoxibuzuzemogu.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/janidop.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/debonekosesipinejesur.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/cadde1ab5f04ab6a3e26e7657482e33c/17364494573.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/didagapuxiditejazi.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/gazudevafutelidiragesogir.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a0ba42b8aaceae40153602708cd1951d/vesatabazolugodofewupurot.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/11856883851.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/86700902813.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d72d20fa5f---38314542591.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c47aae1493805fc11f77cd01ef573ee9/64225623412.pdfIn PDF document text
    • http://one9five.com/userfiles/files/mogabifijalupizaz.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ng6bsue065tjabr596k7i7o41f/sesajasulokixipe.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/zifawepumaridogurisote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=adjectives+formed+with+suffixes+pdfPDF 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_off0000d8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C3 18604 bytes
SHA-256: f5a3a922e81e2e6b41571dfa3c982c497a5bfb82e3aed351fb94745c6c08b3bf
font_01_sfnt_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001202f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202F 11040 bytes
SHA-256: cd70a3e0185a0319318dd1d0dbb0e49ae38fdccf8afe31543da1a6ffe128a35c

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