Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2318d44256dcef…

MALICIOUS

PDF

95.1 KB Created: 2021-08-21 17:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 86587bcb5f8bac70f850d627be8e8836 SHA-1: 0fdb8f5df27bf6012fbf61d567d4f96ae84de6ae SHA-256: ad2318d44256dcefd50fbb986e7c1921ff6a55998718b25fc46f0b7c266ca864
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting an attempt to host or distribute malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern. Although no scripts were directly extracted, the PDF structure and URL findings strongly suggest it's designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/1pvp8mh2ttskodt96h8rqjbsep/18573235602.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4df0a1aad---wosoji.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f6aba48944a61b8672f750320524519e/83221520551.pdfIn PDF document text
    • http://inistor.com/ufiles/files/wekazowotazosot.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/zejunofuma.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/19625114492.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/fijifekezitidofabelotu.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/jekunudewubi.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d26f5b88fd1---65201176469.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/15893351801.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/hn6i4a3toulejuf2jicrru2o8g/pexojafiz.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/8f95248fc2c7ff527b0e4f4dc32e5866/sipejati.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995e287b0cd---64213997280.pdfIn PDF document text
    • http://njchemland.com/upload/files/ridapozaburij.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/13719226229.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/40797516194.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d62aa0b771---laxijitamavojegavesupiza.pdfIn PDF document text
    • https://angkagenap.com/contents//files/5949912202.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/3d26f019a2528327c55f37410e51f46d/33501180982.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9360d02bbe---rufamipasunimijakaduva.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/lexogoduzalimusif.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/5bc26a1bd24565f42feb8cbb17831eef/86727150143.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/59d2e66a4d876e423fea306e9ebbaf13/70899894509.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///rujumamelajutoreradikep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=rap+beats+2020+download+mp3PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A8 11048 bytes
SHA-256: 1819dbe5c12da2292da0927317b114a711dcd44ca990eb00038bf4a24b68f0e4
font_01_sfnt_off00010f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 18232 bytes
SHA-256: e2db206a15ba63c0b890e088e63dbba5437a88bd285948c9d052ca86f9809264
font_02_sfnt_off00013fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBC 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00015501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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