Malicious PDF — malware analysis report

Static analysis result for SHA-256 903c6623b39b676a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 10:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0216b002b37f91db84e43cb24a66a0f2 SHA-1: be1133591a44cc6c4cb945eb7548472055228b51 SHA-256: 903c6623b39b676a2228f46db04b729fa9bdebdef5ec9eef3f3becc35db13d4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which host further malicious PDF files or are hosted on compromised sites. The presence of a "download button" heuristic suggests a social engineering lure to encourage user interaction. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • 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://allytemp.ru/uplcv?utm_term=how+to+send+pdf+file+on+messenger+android PDF link annotation
    • http://446888.top/userfiles/file/72793603706.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/95583681897.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/tademafomurikixu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/dakewewole.pdfIn PDF document text
    • http://dharkaninternational.com/survey/userfiles/files/tenovonujowabunukawiwili.pdfIn PDF document text
    • http://nensi.si/upload/file/88871849740.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/65809339034.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614447b1920e1---zupixavanivapamivifuj.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/3539150783.pdfIn PDF document text
    • http://electric-kernbichler.at/70426066877.pdfIn PDF document text
    • https://anup.bo/images/files/62141846562.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/94875205431.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/21157907808.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/nuvixupaluzefe.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/jowagajuwadasegobusakop.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141903718569---21450550729.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/diwesurefogez.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/71727086436.pdfIn PDF document text
    • http://ndt-ultratech.com/files/soxosodo.pdfIn PDF document text
    • https://ocw.tw/uploads/files/26064339042.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161301c82a63cc---68721877846.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/pawav.pdfIn PDF document text
    • 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_off0000dbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB2 17792 bytes
SHA-256: a2ecc321e574fb5947222ee5e03445e66c1124316f516d4186e2632674978bec
font_01_sfnt_off0001091c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091C 10920 bytes
SHA-256: 980d436bd678bb66191d330f3f509ef3ca248492b91b42339488aa80a76e77bb
font_02_sfnt_off0001222b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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