Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a2c4a98a4f93b8…

MALICIOUS

PDF

86.4 KB Created: 2021-06-29 07:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e5e749b1f87b4d1c8de2b0dcbbe6559 SHA-1: 713e9dc743feaac3582e2f0eacceefd96dd6f3a2 SHA-256: 76a2c4a98a4f93b8935c3c9a0942740b7d5688c3dd4af06116ecf6180da9e26d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with known phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c95b1d86bf1---86080482779.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ff476a350---dusel.pdf
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/wifozud.pdf
    • https://ratsimae.eemedia/contents/file/fojaduvagijiti.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a75d183cad---40065530759.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084d02bc4c7c---sebowel.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/viduxetofobaxifomiwopin.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160af7ee177198---laziwexalibe.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/e4ac38398a45f9a4b4928858445e90ae/veboxu.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/74538967656.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080162f51339---wofukepukanojanad.pdf
    • http://albertopizzetti.it/userfiles/files/54061826273.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074594040027---sobun.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae14a926a---32552235327.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/169d0021cf87b250f8064bdeb5a75fcd/38318937962.pdf
    • https://acgroupenterprise.com/userfiles/file/xedipikusakizosevumi.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/972pvr97qm2ub7e2agdj3ppiq7/fojozixofimob.pdf
    • http://evohome.pl/userfiles/file/25259685309.pdf
    • http://tuzvedo.hu/elemek/file/warumixuladedu.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070cbb10b458---wazuzegoluzukurorukotago.pdf
    • https://zweefvlieg.net/userfiles/file/dujiduwavejidaxiduruja.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607501f5dd708---35537888098.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9eba6f522---35381554846.pdf
    • http://atek-ent.com/upload/file/dogesijituwuvataruzog.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=should+i+buy+manual+or+automatic
    • 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_off0000ec40.bin
03d68f82c94a291c1eae2ab70527291c4771fe139ee77b748b8c8092e02e91d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC40 18068 bytes
font_01_sfnt_off00011b84.bin
7194325f4fb15aee4c88ffb3b164769052bbcf7aa31b51c6c007d836fe0dc17c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B84 10764 bytes
font_02_sfnt_off00013418.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13418 16792 bytes