Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c883a79cab2d5c6…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 01:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ec2a4a4e1f3c4c4be1d15afd591e65c SHA-1: dea4d9a215285e7b7eb66b5a40dde9a9537edd16 SHA-256: 1c883a79cab2d5c6ec405d57a1445e227093b5e2c6c434adefbb8cd5537c3d1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous URLs, many hosted on compromised WordPress sites, forming a link farm. One URL points to a Google feedproxy, potentially used for obfuscation or redirection. The presence of a link farm on compromised infrastructure suggests an attempt to lure users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613944e1755d4---14644084123.pdf
    • https://ijp2.com/contents/files/sogudeveruvixitadisaseze.pdf
    • https://andrejc.si/files/file/41813640235.pdf
    • http://csigikes.hu/admin/fck_upload/file/24528534084.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/0l46gv8p4gupjmhrp0feb4d8f0/85900708944.pdf
    • http://garderoba.sk/images/_file/92930435913.pdf
    • http://studiogiovannone.com/userfiles/files/nanixabilewuluvotog.pdf
    • http://abwingssuffolk1.com/uploads/files/bizolalifatoziwulun.pdf
    • https://nangluongvada.com/uploads/files/kikafujevuxuzavedamore.pdf
    • http://hataylezzeti.com/resimler/files/zigekawewetewifabaridezob.pdf
    • http://ryyw.com/upload/files/2021/09/202109031000039987.pdf
    • http://dpsszczytno.pl/photo/file/32896814515.pdf
    • http://yh-nutri.com/filespath/files/20210911154700.pdf
    • http://sungder.com/upload/nulogalosakulujusizo.pdf
    • http://hrdiborice.cz/erucom1/files/files/35501998457.pdf
    • https://nadrozmerne-sklo.cz/uploads/dejemesirigife.pdf
    • http://runwellconsulting.com/file/file/52165935839.pdf
    • http://newshop.jp/archive/file/notagebufinotowawaluvadox.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/09ffa2683c12a5c64f025e3faf19954b/43241918163.pdf
    • http://mizuho-co.net/file/ck/files/padezebupanewoko.pdf
    • http://bubb.cn/up_file/file/riliposipuwimarex.pdf
    • http://lmnn.ru/userfiles/file/wipibimog.pdf
    • http://atdawnwelift.com/userfiles/file/duleduvodewodedax.pdf
    • https://norservis.cz/files/files/64438632270.pdf
    • http://finchamauto.com/pics/16960727516.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=adb+start+app
    • 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_off0000d770.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 16792 bytes
font_01_sfnt_off0000ef82.bin
a64df84ea936da5810cdf3608144779a93319ca488ec6360f683691ca8065b50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 17440 bytes
font_02_sfnt_off00011c6d.bin
55ca0e9982d8b33e88fbf27605793302700802c6983fb0f385632493888eb0c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6D 10012 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.