Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19ec69fffee2936…

MALICIOUS

PDF

74.4 KB Created: 2021-07-07 01:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b89a7cd65616a66fbe817577d26db0f SHA-1: 265ca1a110feb778f9c85ed2586ea9667157bf5a SHA-256: a19ec69fffee2936aefdc7ba09dfb0160bdf70e1d25fe6dc2eb7171fa6057f9f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://digireg.sk/upload/47004530380.pdf
    • http://www.heksan.com.pl/file/794970584.pdf
    • https://genericdiabeticteststrips.com/userfiles/files/talokofadituresoduxulusi.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/1avg3fv691r50dv6618g4hilok/bufumudes.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6c1c491cb---noliwa.pdf
    • https://sukhayurveda.in/userfiles/file/wafuraloniw.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160894516205d3---69528091727.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609995e97ce55---73904739408.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/0b7922e7a5c44ec109a702f44f95020a/62512378200.pdf
    • http://brkvinc.com/userfiles/file/4141638636.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae61cde0d0---66256441423.pdf
    • https://panificioilcavaliere.it/userfiles/files/4877941442.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edb859b592---16789478709.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/cd2aes3l8dgidb6q3osp2rvknu/jiguposubitu.pdf
    • https://rhodium.vn/uploads/news_file/zogetikutepa.pdf
    • http://microcement.ua/userfiles/file/jujibumebebawutegulupa.pdf
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/jivelamu.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b441337c5e2---59242804568.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/c8a0sglhn8m0sjvvcb8bgov7e6/45382701798.pdf
    • http://banlinhkienlaptop.com/userfiles/file/bopufujuz.pdf
    • http://wecans.net/_UploadFile/Images/file/15080884049.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=my+god+is+awesome+he+can+move+mountains+keep+me+in+the+valley
    • 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_off0000be93.bin
172822690da5769cda450509edf5ebf2ebf7e3e6f2c0d8677faf7b53d263584f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE93 11312 bytes
font_01_sfnt_off0000d8dd.bin
0e01bd530dac3a44ca8923ef44f5b0816fe58c45d6f3ac368233b9ad87faefaa
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DD 16596 bytes
font_02_sfnt_off000103f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F1 16792 bytes