Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f8f209c2cdf8f1…

MALICIOUS

PDF

87.9 KB Created: 2021-08-09 17:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba82cabd39813f275d13b316722fd664 SHA-1: b516f0fea3f4d9ad525ade4de750d3c9bfb93a81 SHA-256: 75f8f209c2cdf8f1f8f1a4affbd5c0fe2f81c984ecc59314e27aa5d3a5996365
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The file contains a large number of embedded URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV also identified this file as malicious, reinforcing the assessment of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f399b90c9b---64058844202.pdf In PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/062975f3cd22dfb2bccd80b2111191f0/84622112094.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/055d0b2b9999332c8a3054b164fd19f6/dezexojexuvovexevuli.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48938475902.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/88864754503.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a493669ae33---69855045489.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e26cee6455c---fubuwa.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/5586117372cf86f2b70edbac66d4f0fa/tegopiwikefoxubotozile.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/witekutapikapelikeliloj.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae452eeeb0---pulito.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/rawalav.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/sgrndc48bllrdd035dp5v51ni6/54561887650.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e5e2f815f50006dbea9f30e1ddac030d/4258757836.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/87350927652.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/gh7tb14msbt8a8u8pij5lkkn07/64068190639.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/ruzidubumasonove.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/64251655562.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/60089522563.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870de69b52b---savuluzodokufejofapog.pdfIn PDF document text
    • https://telenovella-bg.com/files/64149131438.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/mikoze.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/7ondns3i6l18mmrk49jjjg9vhg/xulatorivimonija.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/94835350531.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6922adc0---misuwikopafixexiki.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/52877744765.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/14e87eca99cc0d653d90bddafb1a4ad1/17804706053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+drugs+negatively+affect+societyPDF 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_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA5 16632 bytes
SHA-256: d1670bf681fd49acb3e6c4b7e213d0d5534f8e0b470af48ee2d37caadb90ba8e
font_02_sfnt_off000135df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DF 11008 bytes
SHA-256: 59f76fc3d5639ec452f2a5c16c3a1d22beb8c9b196e85d4515b47cadb5d42fe9

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