Malicious PDF — malware analysis report

Static analysis result for SHA-256 920df53fb89030f4…

MALICIOUS

PDF

94.9 KB Created: 2021-07-02 02:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2aa40287195ee7d2965580af5da22600 SHA-1: cfdc4ee140e5eabb86025a7fef1bbf3273827b3d SHA-256: 920df53fb89030f490203ed539fd7d81d54f9bf3dfc430450714436b433b0d22
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to compromised CMS upload directories and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c38aaf916a6---dawitijesetig.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/fc5a516cddff51b66438384bf9481ddd/64084334061.pdf
    • https://hazeloyun.com/calisma2/files/uploads/15172654308.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed46b3cbc6---romaravuxedabawabilazux.pdf
    • http://geoscan.it/userfiles/files/19766924693.pdf
    • https://lesfeesdelhetre.fr/upload/files/supetagopokul.pdf
    • http://short-story.ru/upload/file/mifunalemixur.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/sexikipetar.pdf
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/nosejuv.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/d3a0dd0e20dffa651c15f7347a6016e0/74175147682.pdf
    • http://momsystem.ru/public/file/widekuwelewigipivikob.pdf
    • https://copperscraphandlers.com/ckfinder/userfiles/files/78353103641.pdf
    • http://synowka.pl/galeria/file/wexeveligod.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/62259056085.pdf
    • https://universal4shipping.net/userfiles/file/xidagomut.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c7e8f1e6375c543ee0a73abf481fd01e/pewadodo.pdf
    • https://nadamasristorante.it/file/nalifigojota.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160de450f529c1---kopatorefafopajezujaj.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/k755vlnhm0n1rt40pdv26eeq0v/86552950331.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/28884430921.pdf
    • http://elmbbq.com/uploads/files/56612740741.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=religions+that+proselytize
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f85d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 16792 bytes
font_01_sfnt_off00011074.bin
32e07205bdccbd623890dd58d452a1888733c3ea8b61a0e499a341ac28f902aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11074 10748 bytes
font_02_sfnt_off00012929.bin
12e925c703d350bf7e8914c9e32c3a5f81396ab90cc4c4435ccca322b296ff62
pdf-font-stream PDF embedded font (sfnt) at offset 0x12929 17400 bytes
font_03_sfnt_off000156ba.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x156BA 16252 bytes