Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6960c34b97c936…

MALICIOUS

PDF

90.7 KB Created: 2021-07-16 22:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6649be4b8a747e957e6d796ce80fc88 SHA-1: ec0c2b2ca04995b7d874c0629e10ab8d9edf8c17 SHA-256: fd6960c34b97c936115b05096cb3e77ac54c99dc0d435dbaf4abdc3deef9f18b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/d6foc0jq747hdhusfqu7qqpmqs/zikulogig.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/8i0pslip6kg1sjv7692cl1ndot/zumetarufafuwema.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e480452fe---25645513118.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b627c7a055c---37488761400.pdf
    • http://thermogroup.ru/uploads/files/92994173770.pdf
    • http://dharmapremipariwar.org/userfiles/file/20370746668.pdf
    • http://residenzaeden-albisola.com/userfiles/files/88927290193.pdf
    • http://foto-preiss.at/upload_files/files/rujojaleborupazadesuk.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/a273da70e9e26f7946659df06ad6e34a/xotijogeruxasuxufexona.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7a820af5b7c833a5df6f64d52ff7815e/bijukaxebap.pdf
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/76885150924.pdf
    • http://gptools.net/userfiles/file/71353105946.pdf
    • http://sllight.ru/design/img/upload/file/lilojarazipebufunevi.pdf
    • http://temple.mo/userfiles/file/papiwomokibeba.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e8076163f28---dajapizinegatoxazu.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbaa6a7a815---bijokemubub.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/fb4e66a3c1dd5e132486448059db2ac9/tabuguxaku.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609300b09c60d---jagiwekadodogunonop.pdf
    • http://lnaixi.com/userfiles/file/20210623114145_1142459542.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/9gnlfec6gh91ff5ckr0ds76ulh/57813035709.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160cb134d57c78---puzuxulubomu.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/88738525762.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b624d1db15a1a976b1181e880d7649eb/wagaxa.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/9iou1ime54h1ohmn2i0tvifd52/72360597468.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/9b0116ab06d1d0cdf212ae061b73c216/piwirajinakemuvazawa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pat+on+the+back
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e1.bin
fc96bb51e68212267b34b5acefce01e3ce1e469c7be8c0a453211fcdfa4f682a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E1 16120 bytes
font_01_sfnt_off0000fe34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 16792 bytes
font_02_sfnt_off0001164b.bin
68f1d92f1c4da92f5b85d6afdf6df467a9797375f2872fcff6c9b78d17507611
pdf-font-stream PDF embedded font (sfnt) at offset 0x1164B 10156 bytes
font_03_sfnt_off00012cf3.bin
f831ca4d0fa3a9123567277d9039a4a30f448ca6324a6f19b7d79fb81c8d9044
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF3 18680 bytes