Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f6785a55be2212…

MALICIOUS

PDF

101.6 KB Created: 2021-07-02 11:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd583961d23ca56b161bb36965db6ebd SHA-1: 700ee7122052e516990dfcb74647823b8107cfea SHA-256: 20f6785a55be221200e9abbad79d715b80b56c79e8f388ce257fa7a8bcd44a50
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. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to distribute further malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

Heuristics 6

  • 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.
  • 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://www.ufolep-69.com/contenus/files/susajutodosuzuvibu.pdf
    • http://hasici-pristroje-eshop.cz/files/file/39457376407.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d684e690dd---buwez.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/85825326263.pdf
    • https://batikatravels.com/userfiles/file/51437223883.pdf
    • http://phuwangnam.com/user_file/file/mowigesuxada.pdf
    • http://almar-bus.pl/userfiles/file/87848517273.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a459c05b2e0a3945ae488344bdbbba4f/satanipiforojezerotajeko.pdf
    • https://vientangluc.com/upload/files/21127229377.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f184c19a97---meberanesekazakujizexa.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a0cd8b91dc759afc0de68f241ed4658c/ninemojopu.pdf
    • http://akicgiyim.com/userfiles/file/nawapijujobugegok.pdf
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/sapedamarodego.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b8627680bd1142b73c269d1e9b5d842b/36263297498.pdf
    • http://daoltrading.com/userData/board/file/61710031266.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071708e0664b---vipifovivumifawixijaron.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdac15b4cb---12364410307.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/def33b764b0ccbc935ed2c37245b3cb3/47830988278.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab449cb07d---towukokoluwos.pdf
    • http://crmloccitanecr.com/campannas/file/88842554431.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609780c0a30bd---dokexedekulumefa.pdf
    • http://hphs1958reunion.com/clients/47465/File/sotunawobugexiwalexovub.pdf
    • http://brezov-gaj.si/uporabnik/file/20134145622.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=track+and+field+memes
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001095f.bin
c7433d1d8c5035ddbe7774cbb5840a22537352a7aa525bd44d36e6ac92031dd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 16128 bytes
font_01_sfnt_off00011eba.bin
b7ae7d4703d4b1209bdf2d92c40d2e43cbfb0b0e2f196579b48ee6a3ff0982cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 18196 bytes
font_02_sfnt_off00014ec2.bin
0db72eb4efc09283e71c7f8b7b557e7f9e74986dbd928220c0137b8780224f2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC2 10472 bytes
font_03_sfnt_off00016673.bin
a1a1781d665c50a76f5d8e4d2322e3e33a4ab76fe8357344688fc33d5e97e897
pdf-font-stream PDF embedded font (sfnt) at offset 0x16673 2176 bytes
font_04_sfnt_off00017014.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17014 16792 bytes