Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f07da8178fe02de…

MALICIOUS

PDF

84.5 KB Created: 2021-07-12 22:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75a2e390358e7d99f28383b0168196fa SHA-1: f843a352127df6be2e07dbdb8ea709f96ef53ed1 SHA-256: 1f07da8178fe02de18a6ca46d778a7877fea0de1535c2ac4ed67ddecb4f481c0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. The embedded URLs likely serve to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://dietetyka-24.pl/images/files/21536726535.pdf
    • http://zuche0551.com/upload/file/gusilusimevowunib.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/7f8907200a6369299414e949c1bffbac/nidewurilebo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38e7613a39---duvoso.pdf
    • http://agcslohian.com/userfiles/file/15734388441.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e4f3d9019---posesabilumifazedibowak.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779ec9def22---zusan.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c4482253305---rujud.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/03f560f11e9c6a159d2c5c4a9db97031/69703353100.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/8773f51ba92f215228d709c5fbd435c4/37650856249.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ttgr4ltldt7ugfmv3ofakm7ufi/jeredoka.pdf
    • https://oklogistic.lv/upload/file/sunufibadimorejazutit.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/78db748c73c7522ad42ed573b8cf4824/wepavodafudubusepa.pdf
    • http://gatewayhotelbangkok.com/upfile_hotel/files/90820985571.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e920ff7e2f0---92206518549.pdf
    • http://worldcar.jp/userfiles/files/88927006867.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/d8ed1c86fc96b4135ce7c55c2ef02522/wiraboxamudiv.pdf
    • https://egokituz.eus/files/galeria/files/32427695105.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087711780e8f---xepiwinozakudikakodajipa.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mlh6oekqr0pd7r4vh2oqkca4l7/jowevuwefusorejogunikipa.pdf
    • https://aurorabersinar2.com/contents//files/32287413940.pdf
    • http://arlingtonhigh1960.com/clients/881088/File/xelibur.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b45eaba36---81644060858.pdf
    • http://paroissedementon.fr/upload/files/kaxatarege.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=get+your+dinner
    • 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_off0000e93d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 16792 bytes
font_01_sfnt_off00010154.bin
ccba8fe6c6b55c61fbb341ea602efc1d6f693308a9265b7fabbf56c2e68bb0e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10154 10120 bytes
font_02_sfnt_off0001180f.bin
22e31cc8e4a2ee3e3f0f470b67477fbcde8f684050276adecc37425d561a13f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1180F 17324 bytes