Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f4c628ac4641f5…

MALICIOUS

PDF

100.9 KB Created: 2021-07-18 11:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ab1731697d1117d9d8faae2b22ae335 SHA-1: 35f6e3919dfccfcd68c35b8a0867627deb486e6c SHA-256: e1f4c628ac4641f57af39aa44c302723e501d27b7c35971de9ea297168a0234a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to distribute further malicious content. The presence of embedded URLs and the PDF structure itself, which is often used for phishing or malware delivery, supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://veraschwemmle.de/fckdata/file/satabi.pdf
    • http://naviway.su/upload/files/wajozitevoloweduwot.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073421a53107---24331539000.pdf
    • http://ratchee.com/ckfinder/userfiles/files/zuwuwidebawol.pdf
    • http://c2ctrading.org/cms_upload/files/22562714719.pdf
    • http://cheers-gifts.com/userfiles/43536059727.pdf
    • http://prinsart.ro/uploads/files/zejipuxabo.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b934b9e5b5c---8977443711.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/55g2n4obkioe6iqi3214n3pvh4/1563181414.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/sugodasetasewosivoluruvu.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/takenekuxaxezimukugijoraf.pdf
    • http://zjqzzx.com/uploadfile/file/2021062302503973499.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078f60d709bf---luxuvelopulinawofizoze.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6175235964b13b165169372f28b0d9c2/vupavupunasujuxokexolapid.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6ad40115---ranevopiki.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cfaf554f9072781244eadc3d46e01384/67409338937.pdf
    • http://kantoromega.pl/userfiles/file/2136075940.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc74964aed---taxigenelupipanapade.pdf
    • https://psychologgia.pl/Upload/file/nefozixiroxalepimabusapug.pdf
    • http://resheto.ru/users_images//fck/file/89088265821.pdf
    • https://audreyheselmans.com/_files/file/40606996149.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc25bee6e---9053680537.pdf
    • http://aristosaigonhotel.vn/uploads/files/goporupanogajotupuv.pdf
    • http://blpest.com/UserFiles/file/80041571213.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=structure+of+flowering+plants+and+its+function
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012508.bin
0b149c0e4fa5a40a352e4e03cc090591698d91565938efe4ecb56e7b687da6d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12508 18208 bytes
font_01_sfnt_off0001543f.bin
3be8a6339fc59915f1aafe3ed109c17e5b53063e36cbc4394243113ac77f8af5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1543F 11056 bytes
font_02_sfnt_off00016dfd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16DFD 16792 bytes