Malicious PDF — malware analysis report

Static analysis result for SHA-256 1797f66dcc67d0ae…

MALICIOUS

PDF

93.4 KB Created: 2021-06-30 04:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fbb209da242c21b6a8f6ae276605d4d SHA-1: 42a2a34ebeef81980641898ae44fa34651b6ca5a SHA-256: 1797f66dcc67d0ae5b7e6d7b81ac5b95b517381ed35347637f25b5b28734cf55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains malicious content or exploits. The heuristics reveal it functions as a link farm, with many external URIs pointing to various websites, some hosted on compromised CMS upload directories. This suggests an attempt to lure users to malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9843

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://foodphotoshop.com/userfiles/files/76661994801.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/o5bsda24mc88lems7e3h1ag528/24978288248.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fb2c69563---minisufejadokam.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c553d7f7c76ca910ab07ca849dc681d9/60305281470.pdf
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/munovozib.pdf
    • http://amandamaitland.com/images/file/xeras.pdf
    • http://ehomeforeclosure.org/images/file/23798116418.pdf
    • http://boeschfamilytravels.com/clients/43210/File/61819522149.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/k5et1at1kcvlu6bh6hh0j04ug5/rojinebatixikokisenulojot.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/41cba86c169fc5f59414ad9f3780d5cd/5131443218.pdf
    • https://nhachoxebus.com/upload/fck/file/nezaretubexexapofivanid.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/vebozibozubuxonuga.pdf
    • https://stijsr.com/userfiles/file/xupisevatumubozegizopokuj.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608494447b75e---lumawufoziluganami.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096b2899badd---lavazumugoxefo.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac98d928d69---resafopabilobetez.pdf
    • http://guoyangmoju.com/userfiles/files/19016834525.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/i1q4nvkhhmgsrpq5rop6006neq/mumadokerimuzofovose.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e4d6729703a27dfa134c59a596ad07db/43431189546.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/povamikerowexopamel.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/c4cuaton5ibqvvi3luobt54av8/vifirixijiro.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f5be3f9ba---jevujezesigusari.pdf
    • http://yishiweb.com/upfiles/files/20210614_063648.pdf
    • http://airconbank.com/upload/fckeditor/file/dusatokebolo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=use+besiege+in+a+sentence
    • 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_off0000e12f.bin
6bf1f84548bdc22ea3b87ac959b337fdf25675ccecb5343474c173641beb35db
pdf-font-stream PDF embedded font (sfnt) at offset 0xE12F 19588 bytes
font_01_sfnt_off000111eb.bin
a19be020b8d041a57fa91322c9ea2a5eb45f215b2295790ecdb8c9e0b060ce5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 3112 bytes
font_02_sfnt_off00011e6a.bin
db2eab532c0dc4f23d85b8ff440dfc352cc3d495ca13670e82e3c436af176cd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6A 16728 bytes
font_03_sfnt_off00013656.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13656 16792 bytes
font_04_sfnt_off00014e6d.bin
44c87078e60f5ae011bf9be640654cefa302342a39976627231f3282e3633715
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6D 10288 bytes