Malicious PDF — malware analysis report

Static analysis result for SHA-256 e377dc444bebc1c4…

MALICIOUS

PDF

82.5 KB Created: 2021-07-05 05:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6e21f7725f4a46193c365d33b62c3ed SHA-1: b628dc3d85b954165ad7caf8076885ccf110c6e7 SHA-256: e377dc444bebc1c4e15ea22117576627352052af6c059f5122c6d0f41fa8c189
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content. The ML classifier strongly suggests malicious intent, and the presence of these links aligns with a phishing or malware distribution campaign. No scripts were extracted, but the overall structure and URL findings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd57937a9---29837782304.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/8vmbosubhe01dlc72nrbil88o3/gomenamenimu.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608109a158fcb---86213879967.pdf
    • http://skiflogistics.ru/userfiles/file/nuzalezes.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/bemak.pdf
    • http://cn-polylysine.com/d/files/48684293172.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/b6d48vs86etlkomdk14086u32e/sonudexu.pdf
    • https://travelstore.tn/userfiles/file/wotaperudenov.pdf
    • https://taevlingar.se/images/pages/file/weluwiwekajosunozinapo.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d360704c74---lilazedofemixob.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03b3b45be6---pexikudosukolete.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/e2e5b56a4b32df58174dbad6e6231733/29728631055.pdf
    • https://advantagelic.com/singhania/downloads/file/2253881795.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a3be65be---futowemuwajunewud.pdf
    • http://imi.vc/upload/files/soviw.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/67fbba49d0d80c4161a7ede146127417/mijefotakizanajevamipaj.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/1464f469f6352bfcceda31a5808c24a4/renev.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/15fab2310f5e1f5f0bd1f9a20f0e4eb1/46163052001.pdf
    • https://liniagdanskzydowo.pl/files/44318629908.pdf
    • http://bjbtrh.com/files/pic/file/20388455559.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a77642e47---87537228294.pdf
    • http://a-kamen.com/userfiles/file/88267676237.pdf
    • http://modnyi-buket.ru/uploads/files/35477097822.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=common+size+financial+statements+example
    • 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_off0000e10d.bin
c2c440752d140447edfd5110ccab68f90948abd79824cecc34a0b7d852cba706
pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 16524 bytes
font_01_sfnt_off00010bd9.bin
3cf53fc69b850b40226c11a7ff8335c21565fd05c8ba9d3b7937a71861c01bf7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 10732 bytes
font_02_sfnt_off000124a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124A1 16792 bytes