Malicious PDF — malware analysis report

Static analysis result for SHA-256 151a7ba77568307b…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 10:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ab7655a2bd2cf434c740a52c1a57e63 SHA-1: 62701f23e93232229238cb141d7ba888f36da6ab SHA-256: 151a7ba77568307b402a10fdc64f8a4e9d12372eb797ba15d443d12766480c8b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. One URI directly uses an IP address, indicating a potential attempt to bypass domain-based defenses. No scripts were extracted, but the PDF structure and URI patterns strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://louvre.lv/res/wysiwyg/file/zogowus.pdf In PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/zesom.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/3611399461.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/xupatokisetuweloluxuba.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/90e8639e251fa224f2f6e854d50b6c70/doboduf.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/17789747163.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/fowipisimalarusuboj.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/femisikosiji.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3394fa6918---fababiwewisuko.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b03f69bc12d---zojubenosetazelawejamub.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/su6bf9o9otfcd0gkct9jr6g0hv/riwirawowirikubad.pdfIn PDF document text
    • https://polaria.cz/images/file/wakomajakube.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/410f14f6b67257da84d34d9e7e9c5c25/tomoburujuzaverapubexa.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abcfe470f46---72312983754.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607697798e6f4---82740032411.pdfPDF link annotation
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4ea88c38c---81147033370.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/38e634c9e02108c0b847f35b1f1be7d6/fifofakesexinezukewat.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/b6f334f42ff45a81602bab7d8f07872b/15098090665.pdfIn PDF document text
    • https://olterus.com/contents/files/xitemunuf.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/219997e7bd313a0e2e42f07ef0ff8c89/77444285938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=questionnaire+anamn%C3%A8se+naturopathie+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_off0000cd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD08 18204 bytes
SHA-256: 65e6eb83acd10c53ee28d09e249963c566c5f9ee73c762e909fea7ba84072cc0
font_01_sfnt_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 11032 bytes
SHA-256: 558873297b1426e783511471c5bff65bcb8c145a03d4ec17d4396b36a0b7941b
font_02_sfnt_off0001141d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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