Malicious PDF — malware analysis report

Static analysis result for SHA-256 713c2714e3f91744…

MALICIOUS

PDF

82.6 KB Created: 2021-08-04 19:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e63fce4655d0fec733d6b89c7d130f70 SHA-1: 15f066d342bcff72ba7b4db5978896c4de25d1e4 SHA-256: 713c2714e3f9174466643772e855796979d4f3ba60c72aada7df0c074cefcf6b
176 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites or appear to be disposable. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts the user to call a phone number, consistent with callback phishing or tech-support scams. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate phishing or malware distribution through the linked domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://benqmusicworkshop.com/fupload/file/64238088466.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/qrbegdurht4dg4vhdn1qa6lr7u/nibuzixatogore.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2d8508849a1eac657acfc4d705042487/63402709318.pdf
    • https://chasehr.in/userfiles/file/42351808147.pdf
    • http://china-hold.com/UploadFile/file/20210607105124604.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/nokisibizejilamizazap.pdf
    • http://lapenya.cat/imgjovesnaves/file/nojufamidix.pdf
    • https://dintek.eu/uploads/file/tinubatex.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/5bbc15377c07b1f17d9ab9a67103205a/24221903713.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/0g56t35a6g6s14nu202pqv4828/13909194343.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/dfce5673bc011fd2a24dbe4a16c44535/85310016643.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c7829c6996c34c32b0b4c3dbdd95e52a/fagerazumukideg.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ce3267cdd---mokeviterumemaziruvuduj.pdf
    • http://yaeram.com/userData/board/file/41942791727.pdf
    • https://ecole-anglais.com/upload/files/meguxumuru.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/vosipekivapororakog.pdf
    • http://geodez.com/pliki/file/71469811502.pdf
    • http://deccanquest.com/konadnew/userfiles/file/55478500471.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/c03de80bc4bf421972c51953146ff5f3/wiwesajasixelaxejaxexo.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d1ab5c3cee970f54e138b2ce58a8c833/zotawuxifaleladi.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888e6eafc64---fixazotupejotok.pdf
    • https://www.ojchamber.com/ckfinder/userfiles/files/norudilaluresen.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/83738517135.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+calculate+weighted+average+duration+of+defined+benefit+obligation
    • 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_off0000e0e2.bin
65d2a07c485fae8de1966e12e75005efffac7452866881e894b5ecf0ec80f4d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 10972 bytes
font_01_sfnt_off0000fa0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 16792 bytes
font_02_sfnt_off00011220.bin
c677dbf67f2e88ec7da5730db455d4923fdf9c198a47ca6a5859ec64cfe05158
pdf-font-stream PDF embedded font (sfnt) at offset 0x11220 16036 bytes