Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb93a7e04007a41…

MALICIOUS

PDF

82.9 KB Created: 2021-07-03 19:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e04b371db00f274dbb68fce2ecdb8dcc SHA-1: dd177dba76349418a27c7b7240318ba92986a2b9 SHA-256: dfb93a7e04007a41aee93cd8addfbfadc25858cafe016278372a3c8b820d639c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised or disposable hosting domains. These links are likely intended to manipulate search engine rankings or redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://mid-europe-ex.com/images/blog//file/39951914763.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082fbb08b4bb---90339327566.pdf
    • http://hungthanhauto.com/luutru/files/xotanivibasa.pdf
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gazatuxa.pdf
    • http://www.contectrade.hu/fckfiles/file/wiforososiwel.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/677e2c867d6ce7ce709f26a25abf71a4/libelute.pdf
    • http://sns.hu/_user/file/lobebimixajuzagura.pdf
    • https://hpsoft.shop/upload/files/71180350851.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/tujisojozadefef.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e5944f354---pelorufu.pdf
    • https://alteanetworks.fr/img/file/vaduxovunomukoboku.pdf
    • https://coebmsf.com/userfiles/file/44784782745.pdf
    • https://clove7.com/userfiles/file/75370323046.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24ab291278---woripekukasabevut.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160926dfd3bdce---vaxifafuwebajoruwejikuva.pdf
    • https://topinsolventa.ro/userfiles/file/69720427827.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/6rdfot4ajk2s8g9ou3ngk8a5lq/kikuvukamulunadejivexeso.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/d32a3rkih91e9f2mdss6u5v522/10731357369.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/cc86b0be1314d9bcf689d05115cb2d1b/zexozafavakupabu.pdf
    • http://skyline1968.com/clients/74864/File/luzitigibokixetitero.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/cp3l6ts1tuisnr59njogbg2cd7/vurixewige.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=list+of+advantages+of+technology
    • 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_off0000e3e4.bin
e78823af9fd6fb3832bbc397b082c345bfff54790acad1e010293f52e1e3ed48
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 10792 bytes
font_01_sfnt_off0000fc8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 16792 bytes
font_02_sfnt_off0001149f.bin
021de403cd6f846623ffbbfd588aca6c6f39db4b537387b54873e1d0ceaf3ca9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 16152 bytes